Sensor rotor, position sensor, motor, motor assembly and vehicle

Abstract

The utility model discloses a sensor rotor, a position sensor, a motor, a motor assembly and a vehicle, the sensor rotor comprises at least one conductor, the conductor comprises a first conductive part and a second conductive part which are arranged along the radial direction, the first conductive part is connected with the second conductive part, and the first conductive part is connected with the second conductive part. And the number of the first conductive parts is equal to that of the second conductive parts. According to the embodiment of the utility model, the forms of the sensor rotor have various selections and are not limited to a circuit board printing type, so that the design of the sensor rotor is relatively simple, the sensor rotor is easy to process, and the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of position sensors, in particular to a sensor rotor, a position sensor, a motor, a motor assembly and a vehicle. Background Art

[0002] The position sensor in the related technology includes a sensor stator and a sensor rotor. The interior of the sensor stator contains a transmitting coil, an absolute position sensing coil, and a high-precision position sensing coil. The period number of the absolute position sensing coil is smaller than the period number of the high-precision position sensing coil. The absolute position sensing coil is used to determine the preliminary position of the motor rotor, and the high-precision position sensing coil is used to improve the accuracy of the position of the motor rotor. The sensor rotor, which is opposite to the high-precision position sensing coil and the absolute position sensing coil, is more complex in design and has a higher cost. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a sensor rotor, which has a simple design and low cost.

[0004] The utility model also provides a position sensor having the sensor rotor.

[0005] The utility model also provides a motor with the position sensor.

[0006] The utility model also provides a motor assembly having the motor.

[0007] The utility model also provides a vehicle with the motor assembly.

[0008] According to the sensor rotor of the embodiment of the first aspect of the utility model, the sensor rotor includes at least one conductor, the conductor includes a first conductive part and a second conductive part arranged in a radial direction, the first conductive part and the second conductive part are connected, and the number of the first conductive parts is equal to the number of the second conductive parts.

[0009] According to the sensor rotor of the embodiment of the utility model, by setting the number of the first conductive part and the second conductive part to be the same, the form of the sensor rotor can be selected in a variety of ways, not limited to the printed circuit board type, so that the design of the sensor rotor is relatively simple, easy to process, and low in cost. In addition, by connecting the first conductive part and the second conductive part, the conductor is formed into an integral structure, which can reduce the manufacturing difficulty, improve the structural stability and reliability of the sensor rotor, and thus improve the reliability of the position sensor.

[0010] According to some embodiments of the present invention, the conductor is an integral piece.

[0011] According to some embodiments of the present invention, the sensor rotor further includes a rotor circuit board, and the conductor is a metal layer provided on the rotor circuit board; or, the conductor is a metal wire and the metal wire extends along an outer contour line of a preset shape.

[0012] A position sensor according to an embodiment of the second aspect of the utility model includes: a sensor stator, the sensor stator includes a stator circuit board, a first induction coil group, a second induction coil group and a transmitting coil group arranged on the stator circuit board, the first induction coil group includes a plurality of absolute position induction coils with a phase difference, the second induction coil group includes a plurality of high-precision position induction coils with a phase difference, and the number of periods of the high-precision position induction coils is greater than the number of periods of the absolute position induction coils; a sensor rotor, the sensor rotor is according to the sensor rotor described in the above embodiment and is sequentially arranged with the stator circuit board in the thickness direction of the stator circuit board, the sensor rotor includes at least one conductor, the first conductive portion corresponds to the position of the first induction coil group, and the second conductive portion corresponds to the position of the second induction coil group.

[0013] According to some embodiments of the present invention, there are multiple first conductive parts and multiple second conductive parts connected one by one, multiple first conductive parts are arranged in the circumferential direction of the first induction coil group, and multiple second conductive parts are arranged in the circumferential direction of the second induction coil group.

[0014] According to some embodiments of the present invention, in the projection on the stator circuit board, the first conductive portion has two first edges arranged opposite to each other in the circumferential direction of the first induction coil group, and the second conductive portion has two second edges arranged opposite to each other in the circumferential direction of the second induction coil group, and both the first edge and the second edge are straight line segments extending in the radial direction of the first induction coil group.

[0015] In some embodiments, the first edge and the second edge located on the same side of the conductor are staggered in the circumferential direction of the first induction coil group, and ends of the first edge and the second edge close to each other are connected by a connecting edge.

[0016] In some examples, the second edge is located between extension lines of two first edges of the first conductive portion.

[0017] According to some embodiments of the present invention, the second induction coil group and the transmitting coil group are both surrounded by the outside of the first induction coil group, and the transmitting coil group is located between the first induction coil group and the second induction coil group.

[0018] According to some embodiments of the utility model, in the projection on the stator circuit board, there is at least one position such that the first conductive portion covers the area of ​​K1 first magnetic flux zones, and the first magnetic flux zone is a projection area surrounded by conductors between two adjacent first intersections in the projection of the absolute position induction coil on the stator circuit board; in the projection on the stator circuit board, there is at least one position such that the second conductive portion covers the area of ​​K2 second magnetic flux zones, and the second magnetic flux zone is an area surrounded by conductors between two adjacent second intersections in the projection of the high-precision position induction coil on the stator circuit board; wherein K1 is an integer greater than or equal to 1, and K2 is an integer greater than or equal to 1.

[0019] In some embodiments, K2 is a positive integer multiple of K1, and K2 / K1 is greater than or equal to 2.

[0020] In some embodiments, in the projection on the stator circuit board, the first conductive portion has two first edges arranged opposite to each other in the circumferential direction of the first induction coil group, and the second conductive portion has two second edges arranged opposite to each other in the circumferential direction of the second induction coil group; the first edge and the second edge are both straight line segments extending in the radial direction of the first induction coil group; the first edge and the second edge located on the same side of the conductor are collinear, and the absolute position induction coil is located radially outside the high-precision position induction coil.

[0021] According to some embodiments of the present invention, the period number of the high-precision position sensing coil is a positive integer multiple of the period number of the absolute position sensing coil.

[0022] According to some embodiments of the present invention, the number of the electrical conductors is equal to the number of cycles of the absolute position sensing coil.

[0023] The motor according to the third aspect of the utility model includes: a housing; a motor stator and a rotating shaft, wherein the rotating shaft rotates relative to the motor stator; a position sensor, wherein the position sensor is the position sensor according to the above embodiment, wherein the sensor stator is fixedly connected to one of the motor stator and the housing, and the sensor rotor is connected to the rotating shaft.

[0024] The motor assembly according to the fourth embodiment of the utility model includes the motor described in the above embodiment.

[0025] A vehicle according to an embodiment of the fifth aspect of the utility model comprises the motor assembly described in the above embodiment.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic diagram of the structure of a position sensor according to some embodiments of the utility model;

[0029] Figure 2 yes Figure 1 A schematic diagram of the distribution of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0030] Figure 3 yes Figure 1 A schematic diagram of the structure of a sensor rotor of a position sensor shown in ;

[0031] Figure 4 yes Figure 1 Schematic diagram of the distribution of multiple electrical conductors of the sensor rotor of the position sensor shown in FIG.

[0032] Figure 5 yes Figure 1 A diagram of changes in induced voltages of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0033] Figure 6 is a schematic diagram of the structure of a position sensor according to other embodiments of the utility model;

[0034] Figure 7 yes Figure 6 A schematic diagram of the distribution of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0035] Figure 8 yes Figure 6 A schematic diagram of the structure of a sensor rotor of a position sensor shown in ;

[0036] Fig. 9 yes Figure 6 A diagram of changes in induced voltages of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0037] Fig.10 is a schematic structural diagram of a position sensor according to some other embodiments of the utility model;

[0038] Fig.11 yes Fig.10 A schematic diagram of the distribution of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0039] Fig.12 yes Fig.10 A diagram of changes in induced voltages of the first induction coil group, the second induction coil group, and the transmitting coil group of the position sensor shown in FIG.

[0040] Fig.13 is a schematic structural diagram of a sensor rotor of a position sensor according to some further embodiments of the utility model;

[0041] Fig.14 for Fig.13 Test diagram of the position sensor shown in;

[0042] Fig.15 is a schematic structural diagram of a sensor rotor of a position sensor according to other embodiments of the utility model;

[0043] Fig.16 for Fig.15 Test diagram of the position sensor shown in;

[0044] Fig.17 is a structural block diagram of a motor assembly according to an embodiment of the utility model;

[0045] Fig.18 It is a simplified structural diagram of a vehicle according to an embodiment of the utility model.

[0046] Reference numerals:

[0047] Position sensor 100,

[0048] stator circuit board 10, first mounting area 101, second mounting area 102, third mounting area 103,

[0049] The first induction coil group 20, the absolute position induction coil 21, the first absolute position induction coil 211, the second absolute position induction coil 212,

[0050] The second induction coil group 30, the high-precision position induction coil 31, the first high-precision position induction coil 311, the second high-precision position induction coil 312,

[0051] Transmitting coil group 40, transmitting coil 41,

[0052] sensor rotor 50, conductor 51, first conductive portion 511, first edge 5111, second conductive portion 512, second edge 5121, connecting edge 5122, metal sheet 513, metal wire 514, metal layer 515, rotor circuit board 52,

[0053] Motor 600, motor assembly 700, vehicle 800,

[0054] The first outer convex point A1, the second outer convex point A2, the first intersection point B1, the second intersection point B2 (B3),

[0055] First area S1, second area S2, extension line L, center line M,

[0056] The first magnetic flux region Q1 and the second magnetic flux region Q2. DETAILED DESCRIPTION

[0057] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] The sensor rotor 50 according to the embodiment of the present invention is described below. The sensor rotor 50 here can be used for a position sensor.

[0059] like Figure 3 , Figure 8 , Fig.11 As shown, the sensor rotor 50 according to the embodiment of the utility model includes at least one conductor 51, that is, the number of the conductors 51 can be one or more, and the conductor 51 includes a first conductive part 511 and a second conductive part 512, and the first conductive part 511 and the second conductive part 512 are arranged radially, where the radial direction may refer to the radial direction of a circle with the rotation center of the sensor rotor 50 as the center, the first conductive part 511 is connected to the second conductive part 512, and the number of the first conductive part 511 is equal to the number of the second conductive part 512.

[0060] According to the sensor rotor 50 of the embodiment of the utility model, by setting the number of the first conductive part 511 and the second conductive part 512 to be the same, the form of the sensor rotor 50 can be selected in a variety of ways, not limited to the printed circuit board type, so that the design of the sensor rotor 50 is relatively simple, easy to process, and low in cost. In addition, by connecting the first conductive part 511 and the second conductive part 512, the conductor 51 is formed into an integral structure, which can reduce the manufacturing difficulty, improve the structural stability and reliability of the sensor rotor 50, and thus improve the reliability of the position sensor 100.

[0061] like Fig.13 As shown, according to some embodiments of the present invention, the sensor rotor 50 is an integral piece. For example, the sensor rotor 50 may be an integrally formed structure, or may be a plurality of components that are formed separately and mechanically connected together.

[0062] Specifically, the conductor 51 can be a metal sheet 513. In the embodiment where the sensor rotor 50 includes a plurality of conductors 51, the plurality of conductors 51 are integrally formed, so that the sensor rotor 50 forms an integrally formed sheet structure. On the one hand, the structural stability and reliability of the sensor rotor 50 can be ensured, and the sensor rotor 50 can be prevented from breaking under high-speed rotation. On the other hand, the additional connection structure or injection molding structure is omitted, and the number of parts of the sensor rotor 50 can be reduced, and the production process can be simplified, thereby improving production efficiency. Of course, the plurality of conductors 51 can also be formed separately, and then connected together by mechanical connection methods (such as welding, bonding, etc.).

[0063] like Fig.14 As shown, according to some embodiments of the present invention, the sensor rotor 50 further includes a rotor circuit board 52, and the conductor 51 is a metal layer 515 provided on the rotor circuit board 52. For example, a copper layer, an aluminum alloy layer, or a copper layer may be directly provided on the rotor circuit board 52.

[0064] Of course, the conductor 51 may also be a metal wire 514, which extends along the outer contour of a preset shape (e.g., the shape of a blade). Specifically, the metal wire 514 is designed to be routed along the periphery of the preset shape, so that the metal wire 514 forms the contour of the conductor 51, which is simple to process and has low manufacturing difficulty, while also ensuring reliability. The wire width of the metal wire 514 is greater than 5 mm, so that the overcurrent requirement can be met.

[0065] It should be noted that the shape of the rotor circuit board 52 can be circular, elliptical, square, polygonal, etc., and the shape of the conductor 51 on the rotor circuit board 52 can be various, as long as the side edge of the conductor 51 cutting into the first induction coil group 20 and the second induction coil group 30 is a straight line passing through the center of the above-mentioned circle when the sensor rotor 50 rotates, that is, it is necessary to satisfy that when the sensor rotor 50 rotates, the side edge of the conductor 51 cutting into the first induction coil group 20 and the second induction coil group 30 is arranged at 90° to the tangent of the transmitting coil group 40.

[0066] The following is combined with Figure 1-Figure 16 A position sensor 100 according to an embodiment of the present invention is described.

[0067] like Figure 1-Figure 4 As shown, the position sensor 100 according to the embodiment of the utility model includes a sensor stator, and the sensor stator includes a stator circuit board 10, a first induction coil group 20, a second induction coil group 30 and a transmitting coil group 40. In the description of the utility model, "first feature" and "second feature" may include two or more of the features. The first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 are all arranged on the stator circuit board 10.

[0068] The first induction coil group 20 includes a plurality of absolute position induction coils 21, which may be sine or cosine coils, and the plurality of absolute position induction coils 21 have a phase difference on the circumference. The "phase difference" here refers to the difference between the phase angles of the periodically changing induced voltage waveforms generated by the plurality of absolute position induction coils 21. Similarly, the second induction coil group 30 includes a plurality of high-precision position induction coils 31, which may be sine or cosine coils, and the plurality of high-precision position induction coils 31 have a phase difference on the circumference.

[0069] Among them, the period number of the high-precision position induction coil 31 is greater than the period number of the absolute position induction coil 21, so that the "first induction coil group 20" here can be used to determine the preliminary position of the motor rotor, and the "second induction coil group 30" can be used to determine the more accurate position of the motor rotor.

[0070] Furthermore, the position sensor 100 also includes a sensor rotor 50, which is the sensor rotor 50 described in the above embodiment. The sensor rotor 50 and the stator circuit board 10 are arranged sequentially in the thickness direction of the stator circuit board 10. The sensor rotor 50 can be rotatable relative to the stator circuit board 10. In order to avoid interference between the sensor rotor 50 and the stator circuit board 10, there can be a gap between the sensor rotor 50 and the stator circuit board 10.

[0071] like Figure 3 As shown, the sensor rotor 50 includes at least one conductor 51, that is, the number of the conductors 51 can be one or more, and the conductor 51 includes a first conductive part 511 and a second conductive part 512, the first conductive part 511 corresponds to the position of the first induction coil group 20, the second conductive part 512 corresponds to the position of the second induction coil group 30, the first conductive part 511 is connected to the second conductive part 512, and the number of the first conductive parts 511 is equal to the number of the second conductive parts 512.

[0072] According to the position sensor 100 of the embodiment of the utility model, by adopting the above-mentioned sensor rotor 50, the form of the position sensor 100 can have multiple options, so that the design of the position sensor 100 is relatively simple, easy to process, and low in cost, and the structural stability and reliability of the position sensor 100 can also be improved.

[0073] According to some embodiments of the present invention, the position sensor 100 further includes a processing module (not shown in the figure), which is used to control the transmitting coil group 40 to transmit signals, and the processing module can determine the position of the sensor rotor 50 based on the received signals of the first induction coil group 20 and the second induction coil group 30.

[0074] Specifically, during operation, alternating current can be supplied to the transmitting coil group 40, and the sensor rotor 50 can generate alternating eddy currents during rotation. The alternating eddy currents can generate alternating magnetic fields. The first induction coil group 20 and the second induction coil group 30 can respectively sense the alternating magnetic fields, and change the magnetic flux in the first induction coil group 20 and the second induction coil group 30, thereby generating a changing induced voltage, thereby determining the motion signal of the sensor rotor 50, for example, the displacement, speed, and real-time position of the sensor rotor 50 can be determined.

[0075] According to some embodiments of the present invention, the first induction coil group 20, the second induction coil group 30, and the transmitting coil group 40 may be arranged in the radial direction of a circle.

[0076] For ease of understanding, the area of ​​the stator circuit board 100 can be divided. Specifically, the stator circuit board 10 has a first installation area 101, a second installation area 102 and a third installation area 103, and the first installation area 101, the second installation area 102 and the third installation area 103 can be arranged in the radial direction of a circle, the first induction coil group 20 is arranged in the first installation area 101, the second induction coil group 30 is arranged in the second installation area 102, and the transmitting coil group 40 is arranged in the third installation area 103, that is, the first induction coil group 20, the second induction coil group 30, and the transmitting coil group 40 are arranged in different installation areas of the stator circuit board 10, and are arranged in the radial direction of a circle.

[0077] For example, the third installation area 103 surrounds the outside of the first installation area 101 , and the second installation area 102 surrounds the outside of the third installation area 103 , so that the transmitting coil group 40 surrounds the outside of the first induction coil group 20 , and the second induction coil group 30 surrounds the outside of the transmitting coil group 40 .

[0078] For example, the second installation area 102 surrounds the outside of the first installation area 101 , and the third installation area 103 surrounds the outside of the second installation area 102 , so that the second induction coil group 30 surrounds the outside of the first induction coil group 20 , and the transmitting coil group 40 surrounds the outside of the first induction coil group 20 .

[0079] For example, the first installation area 101 surrounds the outside of the second installation area 102 , and the third installation area 103 surrounds the outside of the first installation area 101 , so that the first induction coil group 20 surrounds the outside of the second induction coil group 30 , and the transmitting coil group 40 surrounds the outside of the first induction coil group 20 .

[0080] Thus, the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 can be arranged in the radial direction of the above-mentioned circle as needed, and the specific arrangement order can be selected as needed.

[0081] By arranging the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 in the radial direction of a circle, the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 are located in different areas of the stator circuit board 10, so that the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 will not cross in three-dimensional space, and the number of layers and thickness of the stator circuit board 10 can be reduced.

[0082] The projections of the rotation centers of the absolute position sensing coil 21 , the high-precision position sensing coil 31 , the transmitting coil 41 , and the sensor rotor 50 on the stator circuit board 10 overlap.

[0083] According to some embodiments of the present invention, the second induction coil group 30 and the transmitting coil group 40 are both surrounded by the outside of the first induction coil group 20, the transmitting coil group 40 is located between the first induction coil group 20 and the second induction coil group 30, or the transmitting coil group 40 is surrounded by the outside of the second induction coil group 30.

[0084] With such an arrangement, the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 can be located in different areas of the stator circuit board 10, so that the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 will not intersect in three-dimensional space, and the number of layers and thickness of the stator circuit board 10 can be reduced.

[0085] According to some embodiments of the present invention, the first induction coil group 20 and the transmitting coil group 40 are both surrounded by the outside of the second induction coil group 30, the transmitting coil group 40 is located between the first induction coil group 20 and the second induction coil group 30, or the transmitting coil group 40 is surrounded by the outside of the first induction coil group 20.

[0086] With such an arrangement, the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 can be located in different areas of the stator circuit board 10, so that the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 will not intersect in three-dimensional space, and the number of layers and thickness of the stator circuit board 10 can be reduced.

[0087] It can be seen from the above embodiments that the transmitting coil group 40 can be placed outside the first induction coil group 20 or outside the second induction coil group 30, as long as the range passed by the conductor 51 can cover the transmitting coil group 40 when the sensor rotor 50 rotates.

[0088] Similarly, the placement positions of the first induction coil group 20 and the second induction coil group 30 can also be selected as needed, as long as the range passed by the conductor 51 can cover the first induction coil group 20 and the second induction coil group 30 when the sensor rotor 50 rotates.

[0089] like Figure 3 As shown, according to some embodiments of the present invention, the number of the first conductive parts 511 and the second conductive parts 512 are both multiple. In the description of the present invention, "multiple" means two or more, and the multiple first conductive parts 511 and the multiple second conductive parts 512 are connected one by one. The multiple first conductive parts 511 are arranged in the circumferential direction of the first induction coil group 20, and the multiple second conductive parts 512 are arranged in the circumferential direction of the second induction coil group 30.

[0090] That is, the sensor rotor 50 includes a plurality of conductors 51 , each of which includes a first conductive portion 511 and a second conductive portion 512 arranged and connected in the radial direction of the circumference, so that the conductors 51 are formed into an integral structure.

[0091] Therefore, by setting each conductor 51 as an integral structure, it is beneficial to reduce the manufacturing difficulty of the sensor rotor 50 and improve the structural integrity of the sensor rotor 50, thereby improving the structural stability and reliability of the sensor rotor 50, and further improving the reliability of the position sensor 100.

[0092] Among them, on the projection of the stator circuit board 10, the rotation center of the sensor rotor 50 coincides with the center of the above-mentioned circle, and each conductor 51 extends in the radial direction of the circle to span the area where the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 are located, that is, spanning the above-mentioned first installation area 101, the second installation area 102 and the third installation area 103.

[0093] With such arrangement, both ends of the conductor 51 in the radial direction of the circumference can exceed the two outermost and innermost installation areas among the first installation area 101, the second installation area 102 and the third installation area 103, so that when the sensor rotor 50 rotates, the range passed by the conductor 51 can completely cover the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40 in the radial direction.

[0094] like Figure 4As shown, in order to save materials, the sensor rotor 50 can be divided into a plurality of first areas S1 and a plurality of second areas S2. The conductors 51 in the plurality of first areas S1 are obtained by dividing the circle into K×N parts, and taking the N parts arranged alternately as the physical objects. The conductors 51 in the plurality of second areas S2 are obtained by dividing the circle into K×N×N1 parts, and rotating each of the divided conductors 51 so that the center line of one of the conductors 51 is aligned with the center line of the conductor 51 in the first area S1, and taking the N conductors 51 in the second area S2 corresponding to the midpoint position of the conductor 51 in each first area S1 as the conductors 51 of the plurality of second areas S2.

[0095] It should be noted that each conductor 51 of the sensor rotor 50 may be a structure of a special shape, and its edge may be formed by a combination of a straight line segment and a curved line segment extending radially along the circumference, or may be formed by a combination of a straight line segment and a broken line segment extending radially along the circumference. Of course, the edge of the conductor 51 may also be a single straight line segment.

[0096] like Figure 1-Figure 4 , Figure 6-Figure 8 and Figure 10-11 As shown, in some specific embodiments, in the projection on the stator circuit board 10, the first conductive portion 511 has two first edges 5111, and the two first edges 5111 are arranged opposite to each other in the circumferential direction of the first induction coil group 20, and the first edge 5111 is a straight line segment extending in the radial direction of the first induction coil group 20 or the second induction coil group 30, that is, on the projection of the stator circuit board 10, the tangent of the transmitting coil group 40 at the intersection with the straight line where the first edge 5111 is located is perpendicular to the first edge 5111.

[0097] With such configuration, when the sensor rotor 50 rotates to the intersection point B1 of the absolute position induction coil 21 of the first induction coil group 20 , the induced voltage generated by the corresponding absolute position induction coil 21 of the first induction coil group 20 is zero.

[0098] Similarly, in the projection on the stator circuit board 10, the second conductive portion 512 has two second edges 5121, and the two second edges 5121 are arranged opposite to each other in the circumferential direction of the second induction coil group 30. The two second edges 5121 are straight line segments extending in the radial direction of the first induction coil group 20 or the second induction coil group 30, that is, on the projection of the stator circuit board 10, the tangent of the transmitting coil group 40 at the intersection with the straight line where the second edges 5121 are located is perpendicular to the second edges 5121.

[0099] With such configuration, when the sensor rotor 50 rotates to the intersection points B2 and B3 of the high-precision position induction coils 31 of the second induction coil group 30 , the induced voltage generated by the corresponding high-precision position induction coils 31 of the second induction coil group 30 is zero.

[0100] It should be noted that the shapes of the first edge 5111 and the second edge 5121 described above refer to the shapes of the projections of the first edge 5111 and the second edge 5121 on the stator circuit board 10, that is, the projections of the first edge 5111 and the second edge 5121 on the stator circuit board 10 are straight line segments.

[0101] like Figure 1-Figure 4 , Figure 6-Figure 8 As shown, in some examples, the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are staggered in the circumferential direction of the first induction coil group 20, and the ends of the first edge 5111 and the second edge 5121 close to each other are connected by a connecting edge 5122, so that a step structure is formed at the junction of the first conductive portion 511 and the second conductive portion 512.

[0102] Specifically, in an embodiment in which the number of the conductors 51 of the sensor rotor 50 is multiple, a gap is formed between any two adjacent conductors 51, and an edge of each conductor 51 facing the gap includes a first edge 5111, a connecting edge 5122, and a second edge 5121, the first edge 5111 and the second edge 5121 both extend radially along the above-mentioned circumference, and the first edge 5111 and the second edge 5121 are not colinear, and both ends of the connecting edge 5122 are respectively connected to one end of the first edge 5111 and the second edge 5121 close to each other, so that each conductor 51 forms a stepped structure at the junction of the first conductive portion 511 and the second conductive portion 512.

[0103] The connecting edge 5122 may form a straight line segment perpendicular to the first edge 5111 or the second edge 5121 , or the connecting edge 5122 may form an arc segment extending in the circumferential direction of the circle.

[0104] In the above technical solution, by staggering the first edge 5111 and the second edge 5121 of the conductor 51, on the one hand, material can be saved, thereby reducing the material cost of the sensor rotor 50, and on the other hand, the amplitude of the induced voltage generated by the first induction coil group 20 or the second induction coil group 30 can be changed, so that the test results can be displayed more intuitively.

[0105] It should be noted that in the embodiment where the number of the conductors 51 is equal to the number of periods of the absolute position induction coil 21 , the junction between the first induction coil group 20 and the second induction coil group 30 is where the shape of the conductor 51 changes.

[0106] like Figure 3 and Figure 8 As shown, in some specific examples, the second edge 5121 is located between the extension lines L of the two first edges 5111 of the first conductive portion 511. That is, the second conductive portion 512 is located within the region defined by the extension lines L of the two oppositely disposed first edges 5111 of the first conductive portion 511, which can further reduce the material cost of the sensor rotor 50. The "extension line L" referred to here refers to the extension line of the projection of the first edge 5111 on the stator circuit board 10.

[0107] Specifically, in Figure 3 In the embodiment shown, the first conductive portion 511 is connected to an end of the second conductive portion 512 close to the center of the circle, and the second conductive portion 512 is located between the extension lines L extending outward from the two first edges 5111 of the first conductive portion 511. Figure 8 In the embodiment shown in which the first conductive portion 511 is connected to an end of the second conductive portion 512 away from the center of the circle, the second conductive portion 512 is located between the extension lines L of the two first edges 5111 of the first conductive portion 511 extending inwardly.

[0108] like Fig.12 As shown, in some examples, in the projection on the stator circuit board 10, the first conductive portion 511 has two first edges 5111, the two first edges 5111 are arranged opposite to each other in the circumferential direction of the first induction coil group 20, and the first edges 5111 are straight line segments extending in the radial direction of the first induction coil group 20. The second conductive portion 512 has two second edges 5121, the two second edges 5121 are arranged opposite to each other in the circumferential direction of the second induction coil group 30, and the second edges 5121 are straight line segments extending in the radial direction of the second induction coil group 30, and the first edges 5111 and the second edges 5121 located on the same side of the conductive body 51 are collinear.

[0109] Since the first edge 5111 and the second edge 5121 on the same side of the conductor 51 are collinear, the two oppositely disposed edges of the conductor 51 both form straight line segments extending radially along the corresponding induction coil group, making the design of the conductor 51 simpler, the structure smoother, and easier to manufacture.

[0110] In addition, compared with the technical solution in the related art in which the first conductive part and the second conductive part can only cover one magnetic flux zone, the configuration of this embodiment can increase the coverage area of ​​the second conductive part 512. For example, it can be configured to cover multiple magnetic flux zones, thereby generating a larger induced voltage and higher reliability.

[0111] According to some embodiments of the present invention, the stator circuit board 10 is a multi-layer structure, the absolute position sensing coils 21 do not intersect in the same layer of the stator circuit board 10, and the parts of the absolute position sensing coils 21 located in different layers of the stator circuit board 10 intersect in the projection of the stator circuit board 10. That is, on the projection of the stator circuit board 10, the absolute position sensing coils 21 have an intersection point B1, but in fact, the absolute position sensing coils 21 do not intersect in three-dimensional space.

[0112] Similarly, the high-precision position sensing coils 31 do not intersect in the same layer of the stator circuit board 10, and the parts of the high-precision position sensing coils 31 located in different layers of the stator circuit board 10 intersect in the projection of the stator circuit board 10. In other words, on the projection of the stator circuit board 10, the high-precision position sensing coils 31 have intersection points B2 and B3, but in fact, the high-precision position sensing coils 31 do not intersect in three-dimensional space.

[0113] Specifically, Figure 5-Figure 6 , Figure 8 As shown, the multiple absolute position induction coils 21 in the first induction coil group 20 include at least a first absolute position induction coil 211 and a second absolute position induction coil 212, and the multiple high-precision position induction coils 31 in the second induction coil group 30 include at least a first high-precision position induction coil 311 and a second high-precision position induction coil 312.

[0114] Since the transmitting coil group 40 is located at the outermost side, the transmitting coil group 40 can be arranged on the top layer of the stator circuit board 10, and the wires are led out from the top layer. The first absolute position induction coil 211 and the second absolute position induction coil 212 can be arranged on the top layer and the second layer of the stator circuit board 10, respectively, and the wires are led out from the second layer. The first high-precision position induction coil 311 and the second high-precision position induction coil 312 can be arranged on the top layer and the second layer of the stator circuit board 10, respectively, and the wires are led out from the third layer. Alternatively, the first high-precision position induction coil 311 and the second high-precision position induction coil 312 can be arranged on the second layer and the third layer of the stator circuit board 10, respectively, and the wires are led out from the third layer, as long as the first absolute position induction coil 211 and the second absolute position induction coil 212, and the first high-precision position induction coil 311 and the second high-precision position induction coil 312 do not interfere with each other on the same layer.

[0115] Therefore, by setting the stator circuit board 10 into a multi-layer structure, the absolute position sensing coil 21 and the high-precision position sensing coil 31 are respectively crossed in different layers of the stator circuit board 10, which can avoid interference or crossing of the coils, thereby preventing interference and affecting the detection results.

[0116] Furthermore, in the projection on the stator circuit board 10, the top edge of the absolute position sensing coil 21 has a first outer convex point A1. When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer convex point A1, the edge of the first conductive portion 511 passes through the first intersection point B1 of the projection of the absolute position sensing coil 21 on the stator circuit board 10 corresponding to the first outer convex point A1.

[0117] Specifically, Figure 1 and Figure 2 As shown, in this embodiment, the first induction coil group 20 includes a first absolute position induction coil 211 and a second absolute position induction coil 212. In the projection on the stator circuit board 10, the top edges of the first absolute position induction coil 211 and the second absolute position induction coil 212 both have a first outer convex point A1. When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer convex point A1 of the first absolute position induction coil 211, the edge of the first conductive portion 511 (such as the first edge 5111 described above) passes through the first intersection B1 of the projection of the first absolute position induction coil 211 on the stator circuit board 10. When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer convex point A1 of the second absolute position induction coil 212, the edge of the first conductive portion 511 (such as the first edge 5111 described above) passes through the first intersection B1 of the projection of the second absolute position induction coil 212 on the stator circuit board 10.

[0118] When the conductor 51 completely covers the first outer protrusion A1 of the top edge of the absolute position induction coil 21, the induced voltage generated by the absolute position induction coil 21 can reach a maximum value. When the edge of the conductor 51 just covers the first intersection B1 of the absolute position induction coil 21, the induced voltage generated by the absolute position induction coil 21 can be zero.

[0119] In some embodiments, in the projection on the stator circuit board 10, the top edge of the high-precision position sensing coil 31 has a second external protrusion A2, and when the center line M of the second conductive portion 512 passes through the second external protrusion A2, the edge of the second conductive portion 512 passes through the second intersection point B2 in the projection of the high-precision position sensing coil 31 on the stator circuit board 10 corresponding to the second external protrusion A2.

[0120] Specifically, Figure 1 and Figure 2As shown, in the present embodiment, the second induction coil group 30 includes a first high-precision position induction coil 311 and a second high-precision position induction coil 312. In the projection on the stator circuit board 10, the top edges of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 both have a second outer convex point A2. When the sensor rotor 50 rotates until the center line M of the second conductive portion 512 passes through the second outer convex point A2 of the first high-precision position induction coil 311, the edge of the second conductive portion 512 (such as the second edge 5121 described above) passes through the second intersection B2 of the projection of the first high-precision position induction coil 311 on the stator circuit board 10. When the sensor rotor 50 rotates until the center line M of the second conductive portion 512 passes through the second outer convex point A2 of the second high-precision position induction coil 312, the edge of the second conductive portion 512 (such as the second edge 5121 described above) passes through the second intersection B2 of the projection of the second high-precision position induction coil 312 on the stator circuit board 10.

[0121] When the conductor 51 completely covers the second outer protrusion A2 of the top edge of the high-precision position induction coil 31, the induced voltage generated by the high-precision position induction coil 31 can reach a maximum value. When the edge of the conductor 51 just covers the second intersection B2 of the high-precision position induction coil 31, the induced voltage generated by the high-precision position induction coil 31 can be zero.

[0122] In some embodiments, in the projection on the stator circuit board 10, the top edge of the high-precision position sensing coil 31 has a second outer protrusion A2, and when the center line M of the second conductive portion 512 passes through the second outer protrusion A2 of one high-precision position sensing coil 31, the edge of the second conductive portion 512 passes through the second intersection B3 in the projection of another high-precision position sensing coil 31 on the stator circuit board 10, and the second conductive portion 512 covers three second outer protrusions A2.

[0123] Specifically, Fig.10 As shown, in the present embodiment, the second induction coil group 30 includes a first high-precision position induction coil 311 and a second high-precision position induction coil 312. In the projection on the stator circuit board 10, the top edges of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 both have a second outer convex point A2. When the sensor rotor 50 rotates until the center line M of the second conductive portion 512 passes through the second outer convex point A2 of the first high-precision position induction coil 311, the edge of the second conductive portion 512 (such as the above-mentioned second edge 5121) passes through the second intersection point B3 of the projection of the second high-precision position induction coil 312 on the stator circuit board 10.

[0124] In some embodiments, in the projection on the stator circuit board 10, there is at least one position such that the first conductive portion 511 covers the area of ​​K1 first magnetic flux zones Q1, and the first magnetic flux zone Q1 is the projection area enclosed by the conductors between two adjacent first intersections B1 in the projection of an absolute position sensing coil 21 on the stator circuit board 10 ( Figure 1 The absolute position sensing coil 21 is an area enclosed by the thick solid line in FIG. 1 ). Wherein, K1 is an integer greater than or equal to 1.

[0125] like Figure 1 As shown, in this embodiment, the second induction coil group 30 surrounds the outer circumference of the first induction coil group 20, and the first induction coil group 20 includes a first absolute position induction coil 211 and a second absolute position induction coil 212. The first absolute position induction coil 211 is used as an example for description. In the projection on the stator circuit board 10, the top edge of the first absolute position induction coil 211 has a first outer convex point A1, and the first absolute position induction coil 211 itself has multiple first intersection points B1.

[0126] When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer protrusion A1 of the first absolute position sensing coil 211, two oppositely disposed edges of the first conductive portion 511 (such as the first edge 5111 mentioned above) pass through two adjacent first intersections B1 of the projection of the first absolute position sensing coil 211 on the stator circuit board 10. At this time, the current directions of the two conductor segments passing through the two first intersections B1 are opposite, so that the two conductor segments enclose a first magnetic flux area Q1, that is, in this embodiment, K1 is equal to 1.

[0127] like Figure 6 As shown, in this embodiment, the first induction coil group 20 surrounds the outside of the second induction coil group 30, and the first induction coil group 20 includes a first absolute position induction coil 211 and a second absolute position induction coil 212. The first absolute position induction coil 211 is used as an example for description. In the projection on the stator circuit board 10, the top edge of the first absolute position induction coil 211 has a first outer convex point A1, and the first absolute position induction coil 211 itself has multiple first intersection points B1.

[0128] When the sensor rotor 50 rotates until the center line M of the first conductive part 511 passes through the first outer protrusion A1 of the first absolute position sensing coil 211, two oppositely disposed edges of the first conductive part 511 (such as the first edge 5111 described above) pass through two adjacently disposed first intersections B1 of the projection of the first absolute position sensing coil 211 on the stator circuit board 10. At this time, the current directions of the two conductor segments passing through the two first intersections B1 are opposite, so that the two conductor segments enclose a first magnetic flux region Q1. In this embodiment, K1 is equal to 1.

[0129] In some embodiments, in the projection on the stator circuit board 10, there is at least one position such that the second conductive portion 512 covers the area of ​​K2 second magnetic flux zones Q2, and the second magnetic flux zone Q2 is the projection area enclosed by the conductors between two adjacent second intersections B2 in the projection of a high-precision position sensing coil 31 on the stator circuit board 10 ( Fig.10 The area enclosed by the high-precision position sensing coil 31 marked with a thick solid line in FIG. 1 ). Wherein, K2 is an integer greater than or equal to 1.

[0130] like Fig.10 As shown, in this embodiment, the second induction coil group 30 surrounds the outer circumference of the first induction coil group 20, and the second induction coil group 30 includes a first high-precision position induction coil 311 and a second high-precision position induction coil 312. In the projection on the stator circuit board 10, the top edges of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 both have a second outer convex point A2, and the first high-precision position induction coil 311 itself has a plurality of second intersections B2, and the second high-precision position induction coil 312 itself has a plurality of second intersections B3.

[0131] When the sensor rotor 50 rotates until the center line M of the second conductive portion 512 passes through the second outer protrusion A2 of the first high-precision position sensing coil 311, the two oppositely disposed edges of the second conductive portion 512 (such as the second edge 5121 mentioned above) pass through the two second intersection points B3 of the projection of the second high-precision position sensing coil 312 on the stator circuit board 10. At this time, the current directions of the two conductor segments between the two second intersection points B3 are opposite, so that the two conductor segments enclose K2 second magnetic flux areas Q2.

[0132] In this embodiment, K2 is equal to 2. There is another second intersection point B3 between two oppositely disposed edges of the second conductive portion 512 (such as the second edge 5121 described above) passing through the second high-precision position sensing coil 312 and the projection of the stator circuit board 10, so the conductors between the three second intersection points B3 enclose two second magnetic flux areas Q2.

[0133] like Fig.10 As shown, in some embodiments, K2 is a positive integer multiple of K1, and K2 / K1 is greater than or equal to 2. For example, K2 is equal to 2 and K1 is equal to 1; or, K2 is equal to 3 and K1 is equal to 1; or, K2 is equal to 4 and K1 is equal to 1; or, K2 is equal to 4 and K1 is equal to 2, etc., which can be selected according to actual conditions.

[0134] like Fig.10As shown, in some embodiments, in the projection on the stator circuit board 10 , the first conductive portion 511 has two first edges 5111 arranged opposite to each other in the circumferential direction of the first induction coil group 20 , and the second conductive portion 512 has two second edges 5121 arranged opposite to each other in the circumferential direction of the second induction coil group 30 .

[0135] The first edge 5111 and the second edge 5121 are both straight line segments extending in the radial direction of the first induction coil group 20, the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are collinear, and the absolute position induction coil 21 is located radially outside the high-precision position induction coil 31. Here, “the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are collinear” means that, in the projection on the stator circuit board 10, the projection of the first edge 5111 is a straight line segment, the projection of the second edge 5121 is a straight line segment, and the projections of the first edge 5111 and the second edge 5121 on the stator circuit board 10 are on the same straight line.

[0136] Specifically, the first induction coil group 20 includes a first absolute position induction coil 211 and a second absolute position induction coil 212, and the second induction coil group 30 includes a first high-precision position induction coil 311 and a second high-precision position induction coil 312. When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer convex point A1 of the first absolute position induction coil 211, the edge of the first conductive portion 511 passes through the first intersection point B1 of the projection of the first absolute position induction coil 211 on the stator circuit board 10. When the sensor rotor 50 rotates until the center line M of the first conductive portion 511 passes through the first outer convex point A1 of the second absolute position induction coil 212, the first conductive portion 511 is 11 passes through the first intersection B1 of the projection of the second absolute position sensing coil 212 on the stator circuit board 10. When the sensor rotor 50 rotates to the point where the center line M of the second conductive portion 512 passes through the second outer protrusion A2 of the first high-precision position sensing coil 311, the edge of the second conductive portion 512 passes through the third intersection B3 of the projection of the second high-precision position sensing coil 312 on the stator circuit board 10. When the sensor rotor 50 rotates to the point where the center line M of the second conductive portion 512 passes through the second outer protrusion A2 of the second high-precision position sensing coil 312, the edge of the second conductive portion 512 passes through the third intersection B3 of the projection of the first high-precision position sensing coil 311 on the stator circuit board 10.

[0137] According to some embodiments of the present invention, the first induction coil group 20 includes a plurality of absolute position induction coils 21, which have phase differences on the circumference. The second induction coil group 30 includes a plurality of high-precision position induction coils 31, which have phase differences on the circumference.

[0138] The period number of the high-precision position induction coil 31 is a positive integer multiple of the period number of the absolute position induction coil 21 . For example, the period number of the high-precision position induction coil 31 may be twice, three times or four times the period number of the absolute position induction coil 21 .

[0139] Specifically, the phase difference between two adjacent absolute position induction coils 21 is 360° / (N1×2×K1), where N1 is the period number of the absolute position induction coil 21, and K1 is the number of the absolute position induction coils 21 in the first induction coil group 20. The phase difference between two adjacent high-precision position induction coils 31 is 360° / (N2×2×K2), where N2 is the period number of the high-precision position induction coil 31, and K2 is the number of the high-precision position induction coils 31 in the second induction coil group 30.

[0140] In this embodiment, the period number N2 of the high-precision position sensing coil 31 may be twice the period number N1 of the absolute position sensing coil 21 .

[0141] The multiple absolute position induction coils 21 in the first induction coil group 20 include a first absolute position induction coil 211 and a second absolute position induction coil 212, that is, the number K1 of the absolute position induction coils 21 in the first induction coil group 20 is 2, and the number of periods N1 of the first absolute position induction coil 211 and the second absolute position induction coil 212 are both 4. It can be obtained through calculation that the phase difference between the first absolute position induction coil 211 and the second absolute position induction coil 212 is 22.5°.

[0142] The multiple high-precision position induction coils 31 in the second induction coil group 30 include a first high-precision position induction coil 311 and a second high-precision position induction coil 312, that is, the number K2 of the high-precision position induction coils 31 in the second induction coil group 30 is 2, and the number of periods N2 of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 are both 8. It can be obtained by calculation that the phase difference between the first high-precision position induction coil 311 and the second high-precision position induction coil 312 is 11.25°.

[0143] Since the absolute position sensing coil 21 and the high-precision position sensing coil 31 are located in different areas of the stator circuit board 10 (respectively located in the above-mentioned first installation area 101 and the second installation area 102), there is no intersection between their projections on the stator circuit board 10, and the period number of the high-precision position sensing coil 31 is a positive integer multiple of the period number of the absolute position sensing coil 21, so that after the sensor rotor 50 rotates one circle, the period number of the induced voltage obtained on the high-precision position sensing coil 31 is a positive integer multiple of the period number of the induced voltage obtained on the absolute position sensing coil 21, thereby more accurately obtaining the motion signal of the sensor rotor 50.

[0144] In some embodiments, the number of the conductors 51 of the sensor rotor 50 is equal to the number of periods of the absolute position sensing coil 21 , that is, the number of the first conductive parts 511 / second conductive parts 512 of the sensor rotor 50 is equal to the number of periods of the absolute position sensing coil 21 .

[0145] Such an arrangement can ensure the coverage area of ​​the sensor rotor 50, increase the amplitude of the alternating eddy current, thereby changing the magnetic flux in the first induction coil group 20 and the second induction coil group 30, increase the amplitude of the generated induced voltage, and make processing more convenient. There is no need to match the number of periods of the high-precision position induction coil 31, and multiple periods of the high-precision position induction coil 31 can be covered.

[0146] Several embodiments of the position sensor 100 according to the present invention are described below with reference to the accompanying drawings.

[0147] like Figure 1-Figure 16 As shown, the position sensor 100 includes a sensor stator and a sensor rotor 50 .

[0148] The sensor stator includes a stator circuit board 10 , a first induction coil group 20 , a second induction coil group 30 , and a transmitting coil group 40 .

[0149] The stator circuit board 10 can be a multi-layer structure. The first induction coil group 20, the second induction coil group 30, and the transmitting coil group 40 are disposed on the stator circuit board 10 and arranged in the radial direction of a circle, that is, the first induction coil group 20, the second induction coil group 30, and the transmitting coil group 40 are disposed in different areas of the stator circuit board 10.

[0150] The first induction coil group 20 includes a first absolute position induction coil 211 and a second absolute position induction coil 212 , the second induction coil group 30 includes a first high-precision position induction coil 311 and a second high-precision position induction coil 312 , and the transmitting coil group 40 includes a plurality of concentrically arranged transmitting coils 41 .

[0151] The sensor rotor 50 and the stator circuit board 10 are arranged in sequence in the thickness direction of the stator circuit board 10, and the sensor rotor 50 is rotatable relative to the stator circuit board 10. The sensor rotor 50 includes a plurality of conductors 51, and the plurality of conductors 51 are arranged in the circumferential direction of a circle. Each conductor 51 includes a first conductive portion 511 and a second conductive portion 512 which are arranged and connected in its radial direction. The first conductive portion 511 corresponds to the position of the first induction coil group 20, and the second conductive portion 512 corresponds to the position of the second induction coil group 30, that is, the number of the first conductive portions 511 is equal to the number of the second conductive portions 512.

[0152] The position sensor 100 may further include a processing module, which is used to control the transmitting coil group 40 to transmit signals, and the processing module may determine the position of the sensor rotor 50 according to the received signals of the first induction coil group 20 and the second induction coil group 30 .

[0153] Embodiment 1

[0154] like Figure 1-Figure 4 As shown, in the present embodiment, in the projection on the stator circuit board 10, the first conductive portion 511 is closer to the center of the circle than the second conductive portion 512, the first edge 5111 of the first conductive portion 511 and the second edge 5121 of the second conductive portion 512 are staggered in the circumferential direction of the circle, and the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are connected by a connecting edge 5122.

[0155] The second induction coil group 30 surrounds the outside of the first induction coil group 20 , and the transmitting coil group 40 is located between the first induction coil group 20 and the second induction coil group 30 .

[0156] The number of periods of the first absolute position induction coil 211 and the second absolute position induction coil 212 are both 4, and the phase difference between the first absolute position induction coil 211 and the second absolute position induction coil 212 on the above circumference is 360° / (2×2×4), which is equal to 22.5°. The inner convex point of each of the first absolute position induction coil 211 and the second absolute position induction coil 212 is connected to form a circle with a diameter of 5 mm, and the outer convex point A of each of the first absolute position induction coil 211 and the second absolute position induction coil 212 is connected to form a circle with a diameter of 18 mm.

[0157] The transmitting coil group 40 includes three turns of circular transmitting coils 41 , the diameter of the circular transmitting coil 41 located on the inner side is 20 mm, and the diameter of the circular transmitting coil 41 located on the outer side is 22 mm.

[0158] The period number of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 are both 8, which is twice the period number of the first absolute position induction coil 211 / the second absolute position induction coil 212. The phase difference between the first high-precision position induction coil 311 and the second high-precision position induction coil 312 on the above circumference is 360° / (2×2×8), which is equal to 11.25°. The inner convex point of each of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 is connected to form a circle with a diameter of 23mm, and the outer convex point A of each of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 is connected to form a circle with a diameter of 40mm.

[0159] The inner diameter of the sensor rotor 50 is 3 mm, and the outer diameter is 42 mm, so as to ensure that the range swept by the sensor rotor 50 during the rotation process can completely cover the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40. The number of the first conductive parts 511 / the second conductive parts 512 is equal to the number of periods of the first absolute position induction coil 211 / the second absolute position induction coil 212, both of which are 4.

[0160] like Figure 4 As shown, the sensor rotor 50 is divided into a plurality of first areas S1 and a plurality of second areas S2. The conductors 51 in the first area S1 are obtained by dividing the circle into 2×4 parts and taking the staggered 4 parts as the physical objects. The conductors 51 in the second area S2 are obtained by dividing the circle into 2×2×4 (equal to 16) parts and rotating each of the divided conductors 51 so that the center line of one of the conductors 51 is aligned with the center line of the conductor 51 in the first area S1. The four conductors 51 in the second area S2 corresponding to the midpoint position of the conductor 51 in each first area S1 are taken as the four conductors 51 in the second area S2.

[0161] The first high-precision position induction coil 311, the second high-precision position induction coil 312 and the transmitting coil 41 are all arranged in the stator circuit board 10 with a thickness of 1.6 mm. The distance between the sensor rotor 50 and the stator circuit board 10 is 1.48 mm. The rotation center of the sensor rotor 50 coincides with the projection of the center of the first high-precision position induction coil 311, the second high-precision position induction coil 312 and the transmitting coil 41 on the stator circuit board 10.

[0162] like Figure 5 As shown, during operation, a sinusoidal alternating current of 3.5 MHz and a voltage amplitude of 2.5 V can be introduced into the transmitting coil 41, and the alternating magnetic field energy generated by the transmitting coil 41 can be transmitted to the sensor rotor 50. The multiple conductors 51 generate alternating eddy currents at the edges, and the alternating eddy currents can generate alternating magnetic fields. The sensor rotor 50 then feeds back the energy to the first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312. The first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312 obtain an alternating induced voltage envelope of 3.5 MHz. As the sensor rotor 50 rotates, the amplitudes of the first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312 change, thereby forming an induced voltage with sinusoidal characteristics.

[0163] When the sensor rotor 50 rotates until the conductive body 51 covers the outer protrusion A of the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312, the peak value of the corresponding induced voltage envelope generated by the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312 reaches the maximum.

[0164] When the sensor rotor 50 rotates until the edge of the conductive body 51 passes through the intersection B of the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312, the corresponding induced voltage generated by the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312 is 0, and the processing module can extract the induced voltage and obtain the motion signal of the sensor rotor 50 by using function calculation.

[0165] In this embodiment, the first area S1 is obtained by drawing mutually perpendicular X-axis and Y-axis from the rotation center of the sensor rotor 50, and dividing the sensor rotor 50 into four areas. The absolute position sensing coil 21 has four poles. When the sensor rotor 50 rotates one circle, the absolute position sensing coil 21 can generate four induced voltage envelopes, that is, every time the sensor rotor 50 rotates 90°, a complete sinusoidal voltage envelope is generated. The high-precision position sensing coil 31 divides the already divided four areas into eight areas again. The high-precision position sensing coil 31 has eight poles. The number of the first conductive part 511 / the second conductive part 512 of the sensor rotor 50 is still four poles. Therefore, when the sensor rotor 50 rotates one circle, the high-precision position sensing coil 31 can generate eight induced voltage envelopes, that is, every time the sensor rotor 50 rotates 90°, two complete sinusoidal voltage envelopes are generated, corresponding to 0-45° and 45-90° of the single sinusoidal voltage envelope generated by the absolute position sensing coil 21.

[0166] Because in the first area S1, every 90° rotation of the sensor rotor 50 corresponds to a sinusoidal voltage envelope, the accuracy may be limited, while every 45° rotation of the sensor rotor 50 corresponds to a sinusoidal voltage envelope, the accuracy is higher. Therefore, the absolute position sensing coil 21 can be used to determine the area to which the sensor rotor 50 rotates, roughly determine the position, and then use the high-precision position sensing coil 31 to determine a more precise position.

[0167] Embodiment 2

[0168] like Figure 6-Figure 8As shown, in this embodiment, the first conductive portion 511 is farther away from the center of the circle than the second conductive portion 512, the first edge 5111 of the first conductive portion 511 and the second edge 5121 of the second conductive portion 512 are staggered in the circumferential direction of the circle, and the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are connected by a connecting edge 5122.

[0169] The first induction coil group 20 surrounds the outer side of the second induction coil group 30 , and the transmitting coil group 40 surrounds the outer side of the first induction coil group 20 .

[0170] The number of periods of the first absolute position induction coil 211 and the second absolute position induction coil 212 are both 4, and the phase difference between the first absolute position induction coil 211 and the second absolute position induction coil 212 on the above circumference is 360° / (2×2×4), which is equal to 22.5°. The inner convex point of each of the first absolute position induction coil 211 and the second absolute position induction coil 212 is connected to form a circle with a diameter of 22 mm, and the outer convex point A of each of the first absolute position induction coil 211 and the second absolute position induction coil 212 is connected to form a circle with a diameter of 40 mm.

[0171] The transmitting coil group 40 includes three turns of circular transmitting coils 41 , the diameter of the circular transmitting coil 41 located on the inner side is 20 mm, and the diameter of the circular transmitting coil 41 located on the outer side is 22 mm.

[0172] The period number of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 are both 8, which is twice the period number of the first absolute position induction coil 211 / the second absolute position induction coil 212. The phase difference between the first high-precision position induction coil 311 and the second high-precision position induction coil 312 on the above circumference is 360° / (2×2×8), which is equal to 11.25°. The inner convex point of each of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 is connected to form a circle with a diameter of 10 mm, and the outer convex point A of each of the first high-precision position induction coil 311 and the second high-precision position induction coil 312 is connected to form a circle with a diameter of 18 mm.

[0173] The inner diameter of the sensor rotor 50 is 3 mm, and the outer diameter is 42 mm, so as to ensure that the range swept by the sensor rotor 50 during the rotation process can completely cover the first induction coil group 20, the second induction coil group 30 and the transmitting coil group 40. The number of the first conductive parts 511 / the second conductive parts 512 of the sensor rotor 50 is equal to the number of periods of the first absolute position induction coil 211 / the second absolute position induction coil 212, both of which are 4.

[0174] The first high-precision position induction coil 311, the second high-precision position induction coil 312 and the transmitting coil 41 are all arranged in the stator circuit board 10 with a thickness of 1.6 mm. The distance between the sensor rotor 50 and the stator circuit board 10 is 1.48 mm. The rotation center of the sensor rotor 50 coincides with the projection of the center of the first high-precision position induction coil 311, the second high-precision position induction coil 312 and the transmitting coil 41 on the stator circuit board 10.

[0175] like Fig. 9 As shown, when working, a sinusoidal alternating current of 3.5MHz and a voltage amplitude of 2.5V is introduced into the transmitting coil 41, and the alternating magnetic field energy generated by the transmitting coil 41 is transmitted to the sensor rotor 50. The multiple conductors 51 generate alternating eddy currents at the edges, and the alternating eddy currents generate alternating magnetic fields. The sensor rotor 50 then feeds back energy to the first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312. The first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312 obtain an alternating induced voltage envelope of 3.5MHz. As the sensor rotor 50 rotates, the amplitudes of the first absolute position induction coil 211, the second absolute position induction coil 212, the first high-precision position induction coil 311, and the second high-precision position induction coil 312 change, thereby forming a sinusoidal induced voltage.

[0176] When the sensor rotor 50 rotates until the conductive body 51 covers the outer protrusion A of the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312, the peak value of the corresponding induced voltage envelope generated by the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312 reaches the maximum.

[0177] When the sensor rotor 50 rotates until the edge of the conductive body 51 passes through the intersection B of the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312, the corresponding induced voltage generated by the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312 is 0, and the processing module can extract the induced voltage and obtain the motion signal of the sensor rotor 50 by using function calculation.

[0178] Embodiment 3

[0179] like Figure 10-12 As shown, in this embodiment, the first conductive portion 511 is farther away from the center of the circle than the second conductive portion 512, and the first edge 5111 of the first conductive portion 511 and the second edge 5121 of the second conductive portion 512 are aligned in the radial direction of the circle, that is, the first edge 5111 and the second edge 5121 located on the same side of the conductor 51 are collinear.

[0180] The first induction coil group 20 surrounds the outer side of the second induction coil group 30 , and the transmitting coil group 40 surrounds the outer side of the first induction coil group 20 .

[0181] The number of the first conductive part 511 / the second conductive part 512 of the sensor rotor 50 is 4, the number of the period of the first absolute position induction coil 211 / the second absolute position induction coil 212 is 4, the number of the period of the first high-precision position induction coil 311 / the second high-precision position induction coil 312 is 8, and the remaining structure can be the same as that in the second embodiment. No further details will be given here.

[0182] During the rotation of the sensor rotor 50, the range swept by the sensor rotor 50 can completely cover the first induction coil group 20, the second induction coil group 30, and the transmitting coil group 40. The period of the output voltage change of the first absolute position induction coil 211 / the second absolute position induction coil 212 and the first high-precision position induction coil 311 / the second high-precision position induction coil 312 is the ratio of the two groups of period numbers. The test results are as follows Fig.12 By comparison Fig. 9 and Fig.12 It can be seen that by changing the form of the first edge 5111 or the second edge 5121 of the conductor 51, the amplitude of the induced voltage generated by the first induction coil group 20 or the second induction coil group 30 can be changed, so that the test result can be displayed more intuitively.

[0183] Embodiment 4

[0184] The conductor 51 is a metal sheet 513, and the sensor rotor 50 is an integrally formed part, that is, multiple conductors 51 are integrally formed. The test results are as follows: Fig.14 shown.

[0185] The sensor rotor 50 is formed into an integral sheet structure, which can ensure the structural stability and reliability of the sensor rotor 50 on the one hand, and eliminate the need for additional connection structures on the other hand, thereby reducing the number of components of the sensor rotor 50 and simplifying the production process, thereby improving production efficiency.

[0186] Embodiment 5

[0187] like Fig.13 and Fig.14As shown, the sensor rotor 50 includes a rotor circuit board 52 and a plurality of conductors 51 , and the conductors 51 may be metal layers 515 .

[0188] Embodiment 6

[0189] like Fig.15 and Fig.16 As shown, the sensor rotor 50 includes a rotor circuit board 52 and a plurality of conductors 51 . The conductors 51 may be metal wires 514 . The metal wires 514 extend along the outer contour of a preset shape (eg, blades).

[0190] Specifically, the metal wire 514 is designed to be routed along the periphery of a preset shape (such as a blade), so that the metal wire 514 forms a contour line of the preset shape, which is simple to process and has low manufacturing difficulty, while also ensuring reliability. The wire width of the metal wire 514 is greater than 5 mm, so that the overcurrent requirement can be met. The test results are as follows: Fig.16 shown.

[0191] The motor 600 according to the embodiment of the present invention is described below.

[0192] The motor 600 according to the embodiment of the utility model comprises a housing, a motor stator, a rotating shaft and the position sensor 100 described in the above embodiment. The rotating shaft rotates relative to the motor stator, the sensor stator is fixedly connected to one of the motor stator and the housing, and the sensor rotor 50 is connected to the rotating shaft.

[0193] According to the motor 600 of the embodiment of the utility model, by adopting the position sensor 100 in any of the above embodiments, it is beneficial to realize the diversified design of the motor 600 and facilitate selection according to needs, thereby simplifying the processing technology of the motor 600 and reducing costs.

[0194] like Fig.17 As shown, the motor assembly 700 according to the embodiment of the utility model includes the motor 600 described in the above embodiment. Since the motor 600 according to the embodiment of the utility model has the above technical effects, the motor assembly 700 according to the embodiment of the utility model also has the above technical effects, that is, by adopting the above motor 600, the processing technology can be simplified and the cost can be reduced.

[0195] like Fig.18 As shown, a vehicle 800 according to an embodiment of the present utility model includes the motor assembly 700 described in the above embodiment. By adopting the motor assembly 700, the manufacturing process can be simplified and the cost can be reduced.

[0196] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0197] In the description of the present invention, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. In the description of the present invention, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0198] The position sensor 100 , the motor 600 , the motor assembly 700 and other structures and operations of the vehicle 800 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0199] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0200] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sensor rotor, characterized in that: The sensor rotor includes at least one conductor, and the conductor includes a first conductive portion and a second conductive portion arranged in a radial direction, the first conductive portion and the second conductive portion are connected, and the number of the first conductive portions is equal to the number of the second conductive portions.

2. The sensor rotor according to claim 1, characterized in that: The conductor is an integral piece.

3. The sensor rotor according to claim 1, characterized in that: The sensor rotor further includes a rotor circuit board, and the conductor is a metal layer provided on the rotor circuit board; or, the conductor is a metal wire and the metal wire extends along an outer contour line of a preset shape.

4. A position sensor, characterized in that: include: A sensor stator, the sensor stator comprising a stator circuit board, a first induction coil group, a second induction coil group and a transmitting coil group arranged on the stator circuit board, the first induction coil group comprising a plurality of absolute position induction coils with a phase difference, the second induction coil group comprising a plurality of high-precision position induction coils with a phase difference, the period number of the high-precision position induction coil being greater than the period number of the absolute position induction coil; A sensor rotor, wherein the sensor rotor is the sensor rotor according to any one of claims 1 to 3 and is arranged sequentially with the stator circuit board in the thickness direction of the stator circuit board, wherein the first conductive portion corresponds to the position of the first induction coil group, and the second conductive portion corresponds to the position of the second induction coil group.

5. The position sensor according to claim 4, characterized in that: The first conductive parts and the second conductive parts are both multiple and connected one-to-one. The multiple first conductive parts are arranged in the circumferential direction of the first induction coil group, and the multiple second conductive parts are arranged in the circumferential direction of the second induction coil group.

6. The position sensor according to claim 4, characterized in that: In the projection on the stator circuit board, the first conductive portion has two first edges arranged opposite to each other in the circumferential direction of the first induction coil group, and the second conductive portion has two second edges arranged opposite to each other in the circumferential direction of the second induction coil group, and both the first edge and the second edge are straight line segments extending in the radial direction of the first induction coil group.

7. The position sensor according to claim 6, characterized in that: The first edge and the second edge located on the same side of the conductor are staggered in the circumferential direction of the first induction coil group, and ends of the first edge and the second edge close to each other are connected by a connecting edge.

8. The position sensor according to claim 7, characterized in that: The second edge is located between extension lines of two first edges of the first conductive portion.

9. The position sensor according to any one of claims 4 to 8, characterized in that: The second induction coil group and the transmitting coil group both surround the outside of the first induction coil group, and the transmitting coil group is located between the first induction coil group and the second induction coil group.

10. The position sensor according to claim 4, characterized in that: In the projection on the stator circuit board, there is at least one position such that the first conductive portion covers the area of ​​K1 first magnetic flux zones, where the first magnetic flux zone is a projection area enclosed by conductors between two adjacent first intersections in the projection of the absolute position induction coil on the stator circuit board; In the projection on the stator circuit board, there is at least one position such that the second conductive portion covers the area of ​​K2 second magnetic flux zones, where the second magnetic flux zone is a projection area enclosed by conductors between two adjacent second intersections in the projection of the high-precision position induction coil on the stator circuit board; Wherein, K1 is an integer greater than or equal to 1, and K2 is an integer greater than or equal to 1.

11. The position sensor according to claim 10, characterized in that: K2 is a positive integer multiple of K1, and K2 / K1 is greater than or equal to 2.

12. The position sensor according to claim 10, characterized in that: In the projection on the stator circuit board, the first conductive portion has two first edges disposed opposite to each other in the circumferential direction of the first induction coil group, and the second conductive portion has two second edges disposed opposite to each other in the circumferential direction of the second induction coil group; The first edge and the second edge are both straight line segments extending radially along the first induction coil group; the first edge and the second edge located on the same side of the conductor are collinear, and the absolute position induction coil is located radially outside the high-precision position induction coil.

13. The position sensor according to any one of claims 4 to 8, characterized in that: The period number of the high-precision position sensing coil is a positive integer multiple of the period number of the absolute position sensing coil.

14. The position sensor according to any one of claims 4 to 8, characterized in that: The number of the electrical conductors is equal to the number of periods of the absolute position sensing coil.

15. A motor, characterized in that: include: chassis; A motor stator and a rotating shaft, wherein the rotating shaft rotates relative to the motor stator; A position sensor, wherein the position sensor is a position sensor according to any one of claims 4 to 14, wherein the sensor stator is fixedly connected to one of the motor stator and the housing, and the sensor rotor is connected to the rotating shaft.

16. A motor assembly, characterized in that: Comprising an electric machine according to claim 15.

17. A vehicle, characterized in that: Comprising the motor assembly according to claim 16.

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