Position sensor, sensor assembly, motor and vehicle

Abstract

The invention relates to a position sensor, a sensor assembly, a motor and a vehicle, and provides a position sensor comprising a first coil assembly; the second coil group and the first coil group are arranged at intervals; wherein each of the first coil group and the second coil group comprises a transmitting coil and a receiving coil, the number of pole pairs of the receiving coil of the first coil group is a, and the number of pole pairs of the receiving coil of the second coil group is b; a and b meet the condition that the maximum integer common divisor of a and b is 1. According to the technical scheme, the detection precision of the position sensor is improved.

Description

Technical Field

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

[0002] Position sensors are currently used in a variety of settings to measure the position of one component relative to another. They can be used in automotive, industrial, and consumer applications for absolute rotational and linear motion sensing. In many position sensing systems, a first coil assembly is used to induce eddy currents in a metal target that slides or rotates above a second coil assembly. The second coil assembly receives the magnetic field generated by the eddy currents and the first coil assembly and provides a signal to a processor.

[0003] However, in the above technology, since the number of induction coils is small, the position of the object to be measured cannot be accurately determined, and thus the user's usage needs cannot be met. Summary of the Invention

[0004] The embodiments of the present application provide a position sensor, a sensor assembly, a motor, and a vehicle, which improve the detection accuracy of the position sensor to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned objectives, according to a first aspect of the present application, a position sensor is provided, comprising: a first coil group; and a second coil group spaced apart from the first coil group; wherein both the first coil group and the second coil group include a receiving coil, the number of pole pairs of the receiving coil of the first coil group is a, and the number of pole pairs of the receiving coil of the second coil group is b; a and b satisfy: the greatest integer common divisor of a and b is 1.

[0006] Optionally, the first coil group and the second coil group both further include a transmitting coil.

[0007] Optionally, the receiving coil includes a first coil and a second coil, the first coil of the first coil group and the second coil of the first coil group have different phases, and the first coil of the second coil group and the second coil of the second coil group have different phases.

[0008] Optionally, a phase difference between the first coil and the second coil is 90°.

[0009] Optionally, the periods of the first coil and the second coil are the same.

[0010] Optionally, the first coil includes a sine coil and the second coil includes a cosine coil; or the first coil includes a cosine coil and the second coil includes a sine coil.

[0011] Optionally, the position sensor further includes a target part, which is used to move corresponding to the moving body and can move relative to the receiving coil to generate an eddy current effect. The target part covers at least half a period of the receiving coil along the length direction of the position sensor.

[0012] Optionally, the position sensor includes two target parts, and the two target parts are respectively arranged in a one-to-one correspondence with the first coil group and the second coil group.

[0013] Optionally, the two targets move simultaneously along the length of the position sensor.

[0014] Optionally, during the movement of the two target parts, one end of one target part is aligned with one end of the other target part in the length direction of the position sensor, and / or the other end of one target part is aligned with the other end of the other target part in the length direction of the position sensor.

[0015] Optionally, the position sensor further includes a sensor group, and the sensor group includes at least one first coil group and at least one second coil group.

[0016] Optionally, the position sensor includes a plurality of sensor groups.

[0017] Optionally, the position sensor further includes a circuit board, and the first coil group and the second coil group are configured to be formed on the circuit board.

[0018] Optionally, the circuit board has a plurality of through holes, the first coil and the second coil include a plurality of sub-coil segments, two adjacent sub-coil segments are respectively located on both sides in the thickness direction of the circuit board, and the two adjacent sub-coil segments are connected through the through holes.

[0019] Optionally, along the length direction of the circuit board, the center distance between two adjacent through holes is L1, and L1 ≥ 0.15 mm.

[0020] Optionally, the diameter of the through hole is L2, the extension length of the receiving coil in the length direction of the circuit board is L3, the number of through holes is X, and L2, L3 and X satisfy: X<(L3+0.15) / (L2+0.15).

[0021] Optionally, the number of receiving coils is Y, and the receiving coils include M first coils and M second coils, and Y and M satisfy: Y<(L3+0.15) / ((L2+0.15)*2M).

[0022] Optionally, the number of the first coil and the second coil is both 2Y.

[0023] Optionally, each first coil and each second coil has Y starting points.

[0024] Optionally, the phase difference between the first coil and the second coil in the same group of receiving coils is L3 / (2Y*Y)°.

[0025] According to a second aspect of the present application, a sensor assembly is provided, comprising the above-mentioned position sensor.

[0026] According to the third aspect of the present application, a motor is also provided, characterized in that the motor includes: a primary component; a secondary component, and the above-mentioned position sensor primary component and secondary component move relative to each other along the length direction of the position sensor, and the position sensor is used to detect the relative movement.

[0027] According to a fourth aspect of the present application, a vehicle is also provided, comprising the above sensor assembly.

[0028] The position sensor of an embodiment of the present application includes: a first coil group; and a second coil group spaced apart from the first coil group. The first coil group and the second coil group each include a transmitting coil and a receiving coil, the receiving coil of the first coil group having a pole pair number a, and the receiving coil of the second coil group having a pole pair number b; a and b satisfy the following: the greatest common integer divisor of a and b is 1. Through the above technical solution, the original single-pole pair reading of absolute position is replaced with multiple-pole pair reading. The greater the number of pole pairs, the more position points can be read, thereby increasing the detection accuracy of the position sensor. Furthermore, the lack of a common divisor between the pole pairs of the two receiving coil groups prevents data overlap between the position sensor readings at one absolute position and another absolute position. This improves the accuracy of the data read by the position sensor, thereby meeting user requirements.

[0029] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0031] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0032] Figure 1 is a schematic diagram of the overall structure of a position sensor provided in an exemplary embodiment of the present disclosure;

[0033] Figure 2 yes Figure 1 A magnified schematic diagram of point A in the middle;

[0034] Figure 3 yes Figure 1 A magnified schematic diagram of point A in the middle;

[0035] Figure 4 is a schematic structural diagram of a position sensor provided in an exemplary embodiment of the present disclosure;

[0036] Figure 5 Schematic diagram of the linear relationship between the 8-pole coil and the 9-pole coil provided in the exemplary embodiment of the present disclosure.

[0037] Description of reference numerals:

[0038] 1. Position sensor; 11. First coil assembly; 12. Second coil assembly;

[0039] 10. Transmitting coil;

[0040] 20. Receiving coil; 21. First coil; 22. Second coil; 23. Sub-coil segment;

[0041] 30. Target item;

[0042] 40. Circuit board; 41. Through hole

[0043] The length direction X of the position sensor. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0045] like Figures 1 to 5 As shown, according to the first aspect of the present application, a position sensor 1 is provided, comprising: a first coil group 11; a second coil group 12, spaced apart from the first coil group 11; wherein the first coil group 11 and the second coil group 12 both include a receiving coil 20, the number of pole pairs of the receiving coil 20 of the first coil group 11 is a, and the number of pole pairs of the receiving coil 20 of the second coil group 12 is b; a and b satisfy: the greatest integer common divisor of a and b is 1.

[0046] Through the above technical solution, the original single-pole reading of absolute position is changed to multi-pole reading. Since the number of pole pairs is greater, the number of position points to be read is greater, thereby making the detection accuracy of the position sensor 1 higher. At the same time, the two sets of receiving coils 20 have no common divisor in the number of pole pairs, which can prevent the position sensor 1 from reading data overlap at a certain absolute position with that at another absolute position. In this way, the accuracy of the data read by the position sensor 1 can be improved, thereby meeting the user's usage needs.

[0047] Optionally, the first coil group (11) and the second coil group (12) both further include a transmitting coil (10).

[0048] The transmitting coil 10 is driven to form a magnetic field. The transmitting coil 10 can be driven within a frequency range or at a specific frequency to generate an electromagnetic field. This electromagnetic field is the basis for the operation of the sensor, allowing the sensor to interact with surrounding objects. When an object enters or approaches this electromagnetic field, it interacts with the magnetic field, and this interaction causes the electrical signal in the receiving coil 20 to change. The receiving coil 20 is located within the transmitting coil 10 and is used to detect changes in the magnetic field generated by the transmitting coil 10. When an object enters or leaves the magnetic field, it causes changes in the magnetic field strength, which are captured by the receiving coil 20. The receiving coil 20 converts these changes into electrical signals, which are then processed and interpreted to provide information about the object's position. In general, there can be any number of receiving coils 20, however, for ease of discussion, a structure with two groups 20 is shown in this application.

[0049] Optionally, the receiving coil includes a first coil 21 and a second coil 22, and the first coil 21 of the first coil group 11 and the second coil 22 of the first coil group 11 have different phases, and the first coil 21 of the second coil group 12 and the second coil 22 of the second coil group 12 have different phases. In signal processing, if there is a phase difference between the signals sensed by the two coils, this difference can be used to separate or extract specific signal components. At the same time, the phase difference can cause certain types of interference signals to cancel each other out at the receiving end, thereby improving the system's anti-interference ability. Furthermore, utilizing the phase difference between the two coils can improve the accuracy and stability of the measurement to meet the private needs of the position sensor 1.

[0050] In this application, the number of pole pairs refers to the period of the first coil 21 or the second coil 22 on the position sensor 1. For example, the number of pole pairs of the first coil 21 or the second coil 22 in the first coil group 11 is 8, and the number of pole pairs of the first coil 21 or the second coil 22 in the second coil group 12 is 9.

[0051] Optionally, the first coil 21 and the second coil 22 have a phase difference of 90°. Orthogonality refers to the fact that two signals differ in phase by 90°, making them mathematically independent of each other. This orthogonality is very useful in signal processing because it allows us to separate or extract the two signals using appropriate signal processing algorithms. In AC circuits, sine and cosine signals with a phase difference of 90° can effectively reduce electromagnetic interference (EMI) and radio frequency interference (RFI). Because their phases are orthogonal, these interfering signals can be more easily identified and filtered out at the receiving end. Furthermore, in motor control and automation systems, a 90° phase difference between sine and cosine signals enables more precise control. For example, in vector-controlled motors, precise control of motor speed and position can be achieved by adjusting the phase and amplitude of the sine and cosine signals. Furthermore, sine and cosine signals with a phase difference of 90° provide the basis for many complex signal processing algorithms. For example, in Fourier transforms and discrete Fourier transforms (DFTs), sine and cosine functions are the basic elements that constitute these transformations. The two signals being 90° out of phase allows these algorithms to analyze and process the signals more efficiently.

[0052] Optionally, the first coil 21 and the second coil 22 have the same period. If the periods of the first coil 21 and the second coil 22 are inconsistent, the eddy currents generated on the target part 30 can only satisfy the eddy current magnetic field in one of the periods of the first coil 21 and the second coil 22. The eddy current magnetic field sensed by the coil in the other period is uncertain, which is not conducive to the position sensor 1 to accurately locate the position of the object. Therefore, setting the periods of the first coil 21 and the second coil 22 to be the same can enable the position sensor to accurately locate the position of the object to meet the user's usage requirements.

[0053] Optionally, the first coil 21 comprises a sine coil and the second coil 22 comprises a cosine coil, or alternatively, the first coil 21 comprises a cosine coil and the second coil 22 comprises a sine coil. The sine coil is a key component of the position sensor 1, typically used to sense rotational or linear displacement and generate a sinusoidal electrical signal. The induction principle of the sine coil is based on the law of electromagnetic induction: when a magnetic field changes, an electromotive force is generated in the coil. In the position sensor 1, this magnetic field change is typically caused by the displacement being measured. The signal generated by the sine coil has a sinusoidal waveform, and its amplitude and phase are related to the displacement. By measuring the amplitude and phase of this signal, the measured displacement can be determined. Similar to the sine coil, the cosine coil is also a sensing element in the position sensor 1. Unlike the sine coil, the cosine coil generates a cosine waveform. The cosine waveform can be viewed as the result of a sine waveform shifted left or right by π / 2 (i.e., 90°). Therefore, the cosine coil and the sine coil are 90° out of phase. This phase difference enables the sine and cosine coils to jointly provide complete information about the displacement. By measuring the amplitude and phase difference of these two signals, the measured displacement can be accurately calculated.

[0054] In this application, the sine coil corresponds to a coil with a sine waveform, and the cosine coil corresponds to a coil with a cosine waveform.

[0055] In this application, a sine coil and a cosine coil are used in combination. Since the sine coil and the cosine coil differ in phase by 90°, the signals they provide can verify and complement each other. By simultaneously measuring the amplitude and phase difference of the two signals, some measurement errors can be eliminated, thereby improving the measurement accuracy. At the same time, in some cases, external interference may affect the signal of the sine coil or the cosine coil. However, since the two signals differ in phase by 90°, their responses to external interference are different. Therefore, the impact of these interferences can be eliminated or reduced by appropriate signal processing algorithms. Furthermore, the combined application of sine coils and cosine coils can also realize some complex functions, such as angle measurement, speed measurement, and acceleration measurement. These functions have wide application value in industrial automation, robotics, aerospace and other fields.

[0056] In the present application, the first coil 21 is configured as a sine coil, and the second coil 22 is configured as a cosine coil.

[0057] Optionally, the position sensor 1 further includes a target part 30, which is used to move corresponding to the moving body, and the target part 30 can move relative to the receiving coil 20 to generate an eddy current effect. The target part 30 covers at least half the cycle length of the receiving coil 20 along the length direction of the position sensor 1. This can reduce the distance required for the target part 30 to pass through a complete cycle, thereby improving the detection efficiency. In the present application, the target part 30 is a metal part. When the target part 30 moves, it can generate eddy currents, which generate a new electromagnetic field. The receiving coil 20 captures the variable electromagnetic field generated by the transmitting coil 10 and the electromagnetic field induced by the target part 30, thereby generating a voltage at the terminals of the receiving coil 20.

[0058] In this application, the target part is the read head 1 of the position sensor.

[0059] The target member 30 may be formed from a conductive material, preferably a material with relatively high electrical conductivity, such as copper or aluminum. Materials with high electrical conductivity are able to more efficiently transfer charge, thereby generating a stronger signal in the position sensor 1. This enhanced signal enables the position sensor 1 to more accurately detect subtle physical or chemical changes, thereby improving its sensitivity. Because high-conductivity materials have a faster charge transfer rate, the position sensor 1 is able to generate an output signal more quickly after receiving an input signal. This rapid response speed enables the position sensor 1 to monitor and respond to environmental changes in real time, improving the real-time and dynamic performance of the position sensor 1.

[0060] At the same time, high conductivity materials enable sensors to operate in a wider range of temperature and humidity, thereby broadening their application areas. For example, in extreme environments (such as high temperature, high humidity or corrosive environments), traditional sensors may not work properly, while sensors using high conductivity materials can maintain stable performance. High conductivity materials generally have better chemical stability and corrosion resistance, and can resist corrosion and oxidation in the environment. This stability enables the sensor to maintain its performance unchanged during long-term use, improving the reliability and stability of the sensor. The preparation cost of some high conductivity materials (such as new conductive polymer materials) is relatively low and easy to mass-produce. This gives sensors using these materials an advantage in manufacturing costs, which is conducive to the popularization and application of sensors.

[0061] Copper is one of the most conductive metals, with low resistivity and high conductivity. This reduces energy loss and improves efficiency when transmitting electrical energy. Furthermore, copper's chemical properties are relatively stable and it is not easily oxidized, thus maintaining excellent conductivity. Even in harsh environments, copper maintains its stable conductivity. Furthermore, copper's excellent ductility and plasticity make it easy to process into wires of various shapes and sizes. This makes copper highly flexible and adaptable during manufacturing.

[0062] Furthermore, copper has high mechanical strength and is not prone to bending or cracking. At the same time, copper also has good fatigue resistance and can maintain stable performance during long-term use, which allows copper to maintain its conductive properties even in humid or corrosive environments.

[0063] Aluminum's electrical conductivity is second only to copper, and its price is relatively low. This makes aluminum highly valuable in applications where electrical conductivity is required but costs are limited. Aluminum also has a low density, making aluminum wire lighter than wires with the same electrical conductivity. This gives aluminum a significant advantage in applications where weight reduction is crucial, such as aerospace and automotive manufacturing. Aluminum forms a dense oxide film in air, offering excellent corrosion resistance. This allows aluminum to maintain its stable electrical conductivity even in humid or corrosive environments. Aluminum is also less expensive than copper, which helps reduce production costs. Furthermore, aluminum is abundant and easily recyclable and reusable, meeting the requirements of sustainable development.

[0064] Optionally, the position sensor 1 includes two target parts 30, each corresponding to the first coil assembly 11 and the second coil assembly 12. In the present application, the multiple target parts 30 are connected by non-conductive material, and the target parts 30 cannot be connected by metal materials. Since eddy currents flow around the edges of the target parts 30, if multiple target parts 30 are connected, the eddy currents will flow to other target parts 30, and the magnetic field strength sensed by the second coil assembly 12 will be insufficient, which will have an adverse effect, reduce the detection accuracy of the position sensor 1, and hinder normal use by users.

[0065] Optionally, the two target members 30 move simultaneously along the length of the position sensor 1. Since the purpose of this application is to detect the absolute position of the linear position sensor 1, the absolute position is obtained by resolving the signals read by different pole pairs. If the target members 30 do not move simultaneously at the same speed, the generated signals will be unstable, and the position resolved by the position sensor 1 will be inaccurate, thereby reducing the detection accuracy of the position sensor 1.

[0066] Optionally, during the movement of the two target parts 30, one end of one target part 30 is aligned with one end of the other target part 30 in the length direction of the position sensor 1, and / or the other end of one target part 30 is aligned with the other end of the other target part 30 in the length direction of the position sensor 1.

[0067] Optionally, the position sensor 1 further includes a sensor group, which includes at least one first coil group 11 and at least one second coil group 12. In this way, the measurement accuracy of the position sensor 1 can be improved to meet the user's usage requirements.

[0068] Optionally, the position sensor 1 includes a plurality of sensor groups, the specific number of which can be selected according to the use environment of the device, thereby improving the applicability and scope of application of the device.

[0069] Optionally, the position sensor 1 further includes a circuit board 40, and the first coil assembly 11 and the second coil assembly 12 are configured to be formed on the circuit board 40. In this way, the first coil assembly 11 and the second coil assembly 12 can be supported and fixed for subsequent assembly.

[0070] Optionally, the circuit board 40 has a plurality of through-holes 41. The first coil 21 and the second coil 22 include a plurality of sub-coil segments 23. Adjacent sub-coil segments 23 are located on opposite sides of the circuit board 40 in the thickness direction, and are connected by the through-holes 41. The sine coil and cosine coil are formed by traces on the top and bottom of the circuit board 40, and these traces are connected by the through-holes 41. Therefore, the top trace and the bottom trace are connected by the through-holes 41.

[0071] Optionally, along the length direction of the circuit board 40 , the center distance between two adjacent through holes 41 is L1, L1 ≥ 0.15 mm. This configuration can meet the processing requirements of the receiving coil 20 , so as to realize the use function of the receiving coil 20 .

[0072] Optionally, the diameter of through hole 41 is L2, the length of receiving coil 20 extending along the length of circuit board 40 is L3, and the number of through holes 41 provided is X, where L2, L3, and X satisfy the following relationship: X < (L3 + 0.15) / (L2 + 0.15). By limiting the above range, it is possible to avoid an excessive number of through holes 41, which would increase the production cost of position sensor 1 and hinder mass production of position sensor 1.

[0073] Optionally, the number of receiving coils 20 provided is Y, and the receiving coils 20 include M first coils 21 and M second coils 22, where Y and M satisfy the following relationship: Y < (L3 + 0.15) / ((L2 + 0.15) * 2M). This range restriction prevents an excessive number of receiving coils 20 from occupying excessive space, increasing the production cost of the position sensor 1 and hindering mass production of the position sensor 1.

[0074] Optionally, the number of first coils 21 and second coils 22 is 2Y. This range restriction prevents an excessive number of through-holes 41, which would increase the production cost of the position sensor and hinder mass production of the position sensor. This range restriction prevents an excessive number of first coils 21 and second coils 22, which would occupy excessive space and increase the production cost of the position sensor 1, hindering mass production of the position sensor 1.

[0075] Optionally, each first coil 21 and each second coil 22 has Y starting points. The starting points enable the first coil 21 and the second coil 22 to be electrically connected to external components to transmit signals to the outside world, meeting the usage requirements of the device. In this application, the starting point is the vertex of the sine coil or cosine coil, and the sine coil in this application has two vertices, and the cosine coil also has two vertices.

[0076] Optionally, the phase difference between the first coil 21 and the second coil 22 within the same set of receiving coils 20 is L3 / (2Y*Y)°. This configuration allows the first coil 21 and the second coil 22 to jointly provide complete information about the displacement by utilizing the phase difference. By measuring the amplitude and phase difference between the first coil 21 and the second coil 22, the measured displacement can be accurately calculated, thereby improving measurement accuracy.

[0077] In the present application, an LC filter circuit is further provided inside the circuit board 40 , which can reduce voltage shock and thus extend the service life of the position sensor 1 .

[0078] As shown in Table 1 and Figure 5 In this application, the receiving coils 20 are set to two groups, one of which is an 8-pole coil and the other is a 9-pole coil. The pole pairs of the two groups of receiving coils 20 have no common divisor. The running distance of the target part 30 is set to 360mm, and 360 is divided into 360 parts. The length of each part is 1mm. The 8-pole coils are divided into 8 groups of data, each with 45 points. The 9-pole coils are divided into 9 groups of data, each with 40 points. On a length of 360mm, every time it advances 1mm, the absolute position is obtained by reading the positions of the 8-pole coils and the 9-pole coils, as shown in Table 1 below. The absolute position is the value of the 8-pole coils at each L position × 8 + the value of the 9-pole coils × 9. There is no overlap at each position. Figure 5 In the figure, the black lines represent 8-pole coils and the gray lines represent 9-pole coils.

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094] Table 1

[0095] According to a second aspect of the present application, a sensor assembly is provided, comprising the above-mentioned position sensor 1 .

[0096] According to the third aspect of the present application, a motor is also provided, which includes: a primary component; a secondary component, and the above-mentioned position sensor 1, the primary component and the secondary component move relative to each other along the length direction of the position sensor 1, and the position sensor 1 is used to detect relative movement.

[0097] According to a fourth aspect of the present application, a vehicle is also provided, comprising the above sensor assembly.

[0098] The position sensor 1 of the present embodiment includes: a first coil assembly 11; and a second coil assembly 12. The first coil assembly 11 and the second coil assembly 12 are arranged in a one-to-one correspondence, with one set of second coil assemblies 12 having a pole pair number a and the other set of second coil assemblies 12 having a pole pair number b, and a and b having no common divisor. The above technical solution replaces the existing single-pole pair reading of absolute position with a multi-pole pair reading. Since a greater number of pole pairs allows for more position points to be read, the position sensor 1 achieves higher detection accuracy, thus meeting user requirements.

[0099] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0100] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0101] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0102] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0103] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0104] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A position sensor for determining the position of a moving object, characterized in that: include: a first coil assembly; a second coil group, spaced apart from the first coil group; Wherein, the first coil group and the second coil group both include a receiving coil, the number of pole pairs of the receiving coil of the first coil group is a, and the number of pole pairs of the receiving coil of the second coil group is b; Said a and said b satisfy: the greatest common integer divisor of a and b is 1.

2. The position sensor according to claim 1, wherein: The first coil group and the second coil group each further include a transmitting coil.

3. The position sensor according to claim 1, wherein: The receiving coil includes a first coil and a second coil, the first coil of the first coil group and the second coil of the first coil group have different phases, and the first coil of the second coil group and the second coil of the second coil group have different phases.

4. The position sensor according to claim 3, wherein: The phase difference between the first coil and the second coil is 90°.

5. The position sensor according to claim 3, characterized in that The first coil and the second coil have the same period.

6. The position sensor according to claim 3, characterized in that The first coil includes a sine coil and the second coil includes a cosine coil, or the first coil includes a cosine coil and the second coil includes a sine coil.

7. The position sensor according to any one of claims 1 to 6, characterized in that: The position sensor further includes a target member; The target part is used to move corresponding to the moving body, and the target part can move relative to the receiving coil to generate an eddy current effect; The target part covers at least half a period of the receiving coil along the length direction of the position sensor.

8. The position sensor according to claim 7, characterized in that The position sensor includes two target parts, and the two target parts are respectively arranged in a one-to-one correspondence with the first coil group and the second coil group.

9. The position sensor according to claim 8, characterized in that The two target parts move simultaneously along the length direction of the position sensor.

10. The position sensor according to claim 9, characterized in that During the movement of the two target parts, one end of one of the target parts is aligned with one end of the other target part in the length direction of the position sensor, and / or the other end of one of the target parts is aligned with the other end of the other target part in the length direction of the position sensor.

11. The position sensor according to claim 1, wherein: The position sensor further includes a sensor group including at least one first coil group and at least one second coil group.

12. The position sensor according to claim 11, characterized in that The position sensor includes a plurality of the sensor groups.

13. The position sensor according to claim 1, wherein: The position sensor further includes a circuit board, and the first coil group and the second coil group are configured to be formed on the circuit board.

14. The position sensor according to claim 13, characterized in that The circuit board has a plurality of through holes, the first coil and the second coil include a plurality of sub-coil segments, two adjacent sub-coil segments are respectively located on both sides of the thickness direction of the circuit board, and the two adjacent sub-coil segments are connected through the through holes.

15. The position sensor according to claim 14, characterized in that Along the length direction of the circuit board, the center distance between two adjacent through holes is L1, and L1 is ≥ 0.15 mm.

16. The position sensor according to claim 14, wherein: The diameter of the through hole is L2, the extending length of the receiving coil in the length direction of the circuit board is L3, and the number of the through holes is X. L2, L3 and X satisfy: X<(L3+0.15) / (L2+0.15).

17. The position sensor according to claim 16, characterized in that The number of the receiving coils is Y, and the receiving coils include M first coils and M second coils. The Y and the M satisfy: Y<(L3+0.15) / ((L2+0.15)*2M).

18. The position sensor according to claim 17, characterized in that The number of the first coils and the number of the second coils are both 2Y.

19. The position sensor according to claim 18, characterized in that Each of the first coils and each of the second coils has Y starting points.

20. The position sensor according to claim 19, characterized in that The phase difference between the first coil and the second coil in the same group of receiving coils is L3 / (2Y*Y)°.

21. A sensor assembly, characterized in that: The position sensor comprises the position sensor according to any one of claims 1 to 20.

22. A motor, characterized in that: The motor comprises: Primary components; secondary components; and a position sensor according to claim 20; The primary assembly and the secondary assembly move relative to each other along a length direction of the position sensor, and the position sensor is used to detect the relative movement.

23. A vehicle, characterized in that: Comprising the motor of claim 22.

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