Position sensor, sensor assembly, electric motor, and vehicle

Abstract

A position sensor (1), comprising: a first coil set (11); and a second coil set (12) spaced apart from the first coil set (11). The first coil set (11) and the second coil set (12) each comprise a transmit coil (10) and a receive coil (20), wherein the number of pole pairs of the receive coil (20) of the first coil set (11) is a, and the number of pole pairs of the receive coil (20) of the second coil set (12) is b, a and b satisfying: the greatest common divisor of a and b is 1. Further disclosed are a sensor assembly (100), an electric motor (200), and a vehicle (300).

Description

Position sensors, sensor assemblies, motors and vehicles

[0001] This application claims priority to Chinese Patent Application No. 202411589832.1, filed on November 7, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of position sensor technology, and more particularly to a position sensor, sensor assembly, motor, and vehicle. Background Technology

[0003] Currently, position sensors are used in various setups to measure the position of one component relative to another. Position sensors can be used in automotive, industrial, and consumer applications for absolute rotation and linear motion sensing. In many positioning sensing systems, a first coil group is used to sense eddy currents in a metal target sliding or rotating above a second coil group. The second coil group receives the magnetic field generated by the eddy currents and the first coil group and provides a signal to a processor.

[0004] However, in the above technology, due to the limited number of induction coils, the position of the object to be measured cannot be accurately determined, thus failing to meet the user's needs. Technical issues

[0005] The purpose of this application is to improve the detection accuracy of position sensors. Technical solutions

[0006] This application provides a position sensor, including: a first coil group; and a second coil group, which is 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 common divisor of a and b is 1.

[0007] This application also provides a sensor assembly, including the position sensor described above.

[0008] This application also provides a motor, including: a primary component; a secondary component; and the aforementioned position sensor. The primary component and the 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 motion.

[0009] This application also provides a vehicle including the sensor assembly described above. Beneficial effects

[0010] The position sensor provided in this application changes the original single-pole reading of absolute position to multi-pole reading. Since the number of pole pairs is more, there are more reading position points, which makes the detection accuracy of the position sensor higher. At the same time, the fact that the number of pole pairs of the two sets of receiving coils has no common factor can prevent the position sensor from reading data that overlaps at one absolute position with another. This can improve the accuracy of the position sensor reading data and thus meet the user's needs. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the overall structure of the position sensor provided in an exemplary embodiment of this application;

[0012] Figure 2 is an enlarged view of point A in Figure 1;

[0013] Figure 3 is an enlarged view of point A in Figure 1;

[0014] Figure 4 is a schematic diagram of the structure of the position sensor provided in an exemplary embodiment of this application;

[0015] Figure 5 is a schematic diagram of the linear relationship between the 8-pair and 9-pair coils provided in an exemplary embodiment of this application;

[0016] Figure 6 is a schematic diagram of the structure of the sensor assembly provided in an exemplary embodiment of this application;

[0017] Figure 7 is a schematic diagram of the structure of the motor provided in an exemplary embodiment of this application;

[0018] Figure 8 is a structural schematic diagram of the vehicle provided in an exemplary embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Position sensor; 11. First coil group; 12. Second coil group; 10. Transmitting coil; 20. Receiving coil; 21. First coil; 22. Second coil; 23. Sub-coil segment; 30. Target component; 40. Circuit board; 41. Through hole; 100. Sensor assembly; 200. Motor; 210. Primary assembly; 220. Secondary assembly; 300. Vehicle; X, length direction of the position sensor. Embodiments of the present invention

[0020] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0023] As shown in Figures 1 to 5, according to a first aspect of this application, a position sensor 1 is provided, comprising: a first coil group 11; and a second coil group 12, which is disposed at an interval 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 common divisor of a and b is 1.

[0024] By using the above technical solution, the original single-pole reading of absolute position is changed to multi-pole reading. Since there are more pole pairs, there are more reading position points, which makes the detection accuracy of position sensor 1 higher. At the same time, the fact that the number of pole pairs of the two sets of receiving coils 20 has no common factor can prevent the position sensor 1 from reading data that overlaps with the data at one absolute position and another absolute position. This can improve the accuracy of the data read by position sensor 1 and thus meet the user's needs.

[0025] In some embodiments, both the first coil group 11 and the second coil group 12 further include a transmitting coil 10.

[0026] In this design, the transmitting coil 10 is driven to generate a magnetic field. The transmitting coil 10 can be driven within a frequency range or at a specific frequency to generate an electromagnetic field, which is the basis for the sensor's operation, allowing the sensor to interact with surrounding objects. When an object enters or approaches this electromagnetic field, it interacts with the magnetic field, causing a change in the electrical signal in the receiving coil 20. 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 a change in the magnetic field strength, which is 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. Typically, any number of receiving coils 20 can be used; however, for ease of discussion, a structure with two sets of 20 is shown in this application.

[0027] In some embodiments, the receiving coil includes a first coil 21 and a second coil 22. The first coil 21 and the second coil 22 of the first coil group 11 are out of phase, and the first coil 21 and the second coil 22 of the second coil group 12 are out of phase. In signal processing, if the signals sensed by the two coils have a phase difference, this difference can be used to separate or extract specific signal components. Simultaneously, 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 capability. Furthermore, utilizing the phase difference between the two coils can improve the accuracy and stability of the measurement, meeting the specific requirements of the position sensor 1.

[0028] 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.

[0029] In some embodiments, the phase difference between the first coil 21 and the second coil 22 is 90°. Orthogonality refers to two signals being 90° out of phase, making them mathematically independent. 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 90° phase difference can effectively reduce electromagnetic interference (EMI) and radio frequency interference (RFI). Because of their orthogonal phases, these interfering signals are easily identified and filtered out at the receiving end. Meanwhile, in motor control and automation systems, a 90° phase difference between sine and cosine signals enables precise control. For example, in vector control 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 90° phase difference provide the basis for many complex signal processing algorithms. For example, in Fourier transforms and discrete Fourier transforms (DFTs), sine and cosine functions are fundamental elements constituting these transforms. The two signals, with a phase difference of 90°, enable these algorithms to effectively analyze and process signals.

[0030] In some embodiments, the periods of the first coil 21 and the second coil 22 are the same. If the periods of the first coil 21 and the second coil 22 are not the same, the eddy currents generated on the target 30 can only satisfy the eddy current magnetic field of one of the periods of the first coil 21 and the second coil 22, while the eddy current magnetic field induced by the coil in the other period is uncertain, which is not conducive to the position sensor 1 accurately locating the object. Therefore, setting the periods of the first coil 21 and the second coil 22 to be the same enables the position sensor to accurately locate the object, thereby meeting the user's needs.

[0031] In some embodiments, the first coil 21 includes a sine coil, and the second coil 22 includes a cosine coil, or vice versa. The sine coil is an important 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 the magnetic field changes, an electromotive force is generated in the coil. In the position sensor 1, this change in magnetic field is typically caused by the displacement being measured. The signal generated by the sine coil has a sinusoidal waveform, the amplitude of which and its phase are related to the displacement. By measuring the amplitude and phase of this signal, the measured displacement can be determined. The cosine coil, similar to the sine coil, is also a sensing element in the position sensor 1. Unlike the sine coil, the signal generated by the cosine coil has a cosine waveform. A cosine waveform can be viewed as 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 allows the sine and cosine coils to jointly provide complete information about the displacement. By measuring the amplitude and phase difference between these two signals, the displacement being measured can be accurately calculated.

[0032] In this application, a sine coil corresponds to a coil with a sine waveform, and a cosine coil corresponds to a coil with a cosine waveform.

[0033] In this application, sine and cosine coils are used in combination. Since the sine and cosine coils are 90° out of phase, their signals can verify and complement each other. By simultaneously measuring the amplitude and phase difference of these two signals, some measurement errors can be eliminated, thereby improving measurement accuracy. However, in some cases, external interference may affect the signals of either the sine or cosine coils. But because these two signals are 90° out of phase, their responses to external interference are different. Therefore, the effects of these interferences can be eliminated or reduced through appropriate signal processing algorithms. Furthermore, the combined application of sine and cosine coils can also realize some complex functions, such as angle measurement, velocity measurement, and acceleration measurement. These functions have wide application value in fields such as industrial automation, robotics, and aerospace.

[0034] In this application, the first coil 21 is configured as a sine coil and the second coil 22 is configured as a cosine coil.

[0035] In some embodiments, the position sensor 1 further includes a target element 30, which is configured to move in correspondence with a moving body and is movable relative to the receiving coil 20 to generate an eddy current effect. The target element 30 covers at least half a cycle length of the receiving coil 20 along the length direction of the position sensor 1. This reduces the distance required for the target element 30 to complete a full cycle, thereby improving detection efficiency. In this application, the target element 30 is a metal part, which generates eddy currents when it moves. These eddy currents generate a new electromagnetic field, and the receiving coil 20 captures the variable electromagnetic field generated by the transmitting coil 10 and the electromagnetic field induced by the target element 30, thereby generating a voltage at the terminals of the receiving coil 20.

[0036] In this application, the target component is the read head 1 of the position sensor.

[0037] The target element 30 can be formed of a conductive material, and can be formed of a material with relatively high conductivity, such as copper or aluminum. High conductivity materials can efficiently transfer charge, thereby generating a strong signal in the position sensor 1. This enhanced signal allows the position sensor 1 to accurately detect minute physical or chemical changes, thus improving its sensitivity. Due to the fast charge transport speed of the high conductivity material, the position sensor 1 can quickly generate an output signal after receiving an input signal. This fast response speed enables the position sensor 1 to monitor and respond to environmental changes in real time, improving the real-time performance and dynamic characteristics of the position sensor 1.

[0038] Meanwhile, high-conductivity materials enable sensors to operate over a wide range of temperatures and humidity levels, thus broadening their application areas. For example, in extreme environments (such as high temperature, high humidity, or corrosive environments), traditional sensors may fail to function properly, while sensors using high-conductivity materials can maintain stable performance. High-conductivity materials typically possess good chemical stability and corrosion resistance, resisting corrosion and oxidation in the environment. This stability allows sensors to maintain their performance over long-term use, improving their reliability and stability. Some high-conductivity materials (such as novel conductive polymers) are relatively inexpensive to manufacture and easy to mass-produce. This gives sensors using these materials a cost advantage, facilitating their widespread adoption and application.

[0039] Copper is one of the best electrical conductors, exhibiting low resistivity and high conductivity. This allows copper to reduce energy loss and improve efficiency when transmitting electrical energy. Furthermore, copper is chemically stable and does not easily oxidize, thus maintaining its excellent conductivity. Even in harsh environments, copper retains its stable conductivity. Moreover, copper has good ductility and plasticity, making it easy to process into wires of various shapes and sizes. This gives copper excellent flexibility and adaptability in manufacturing processes.

[0040] Copper has high mechanical strength and is not easily bent or cracked. At the same time, copper also has good fatigue resistance, maintaining stable performance over long-term use. This allows copper to maintain its electrical conductivity even in humid or corrosive environments.

[0041] Aluminum's electrical conductivity is second only to copper, and its price is relatively low. This makes aluminum highly valuable in applications where conductivity is required but cost is limited. Aluminum has a low density, meaning that aluminum wires are lighter for the same 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, providing excellent corrosion resistance. This allows aluminum to maintain its electrical conductivity even in humid or corrosive environments. Compared to copper, aluminum is cheaper, which helps reduce production costs. Furthermore, aluminum resources are abundant, easily recycled and reused, aligning with sustainable development requirements.

[0042] In some embodiments, the position sensor 1 includes two target elements 30, which are respectively configured in a one-to-one correspondence with the first coil group 11 and the second coil group 12. In this application, the multiple target elements 30 are connected by non-conductive materials, and the target elements 30 cannot be connected by metallic materials. Since eddy currents flow along the edges of the target elements 30, if multiple target elements 30 are connected, the eddy currents will flow to other target elements 30, resulting in insufficient magnetic field strength sensed by the second coil group 12. This will have an adverse effect, reducing the detection accuracy of the position sensor 1 and hindering normal use by the user.

[0043] In some embodiments, the two target components 30 move simultaneously along the length direction 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 calculated by solving the signals read from different poles. If the target components 30 do not move simultaneously at the same speed, the generated signals will be uncertain, the position calculated by the position sensor 1 will be inaccurate, and the detection accuracy of the position sensor 1 will be reduced.

[0044] In some embodiments, during the movement of the two target components 30, one end of one target component 30 is aligned with one end of the other target component 30 in the length direction of the position sensor 1, and / or the other end of one target component 30 is aligned with the other end of the other target component 30 in the length direction of the position sensor 1.

[0045] In some embodiments, the position sensor 1 further includes a sensor group comprising at least one first coil group 11 and at least one second coil group 12. This improves the measurement accuracy of the position sensor 1 to meet user requirements.

[0046] In some embodiments, the position sensor 1 includes multiple sensor groups. The specific number of groups can be selected according to the usage environment of the device, thereby improving the applicability and scope of application of the device.

[0047] In some embodiments, the position sensor 1 further includes a circuit board 40, on which a first coil group 11 and a second coil group 12 are configured to be formed. This allows the first coil group 11 and the second coil group 12 to be received and fixed for subsequent assembly.

[0048] In some embodiments, the circuit board 40 has a plurality of through holes 41, and the first coil 21 and the second coil 22 include a plurality of sub-coil segments 23, with adjacent sub-coil segments 23 located on opposite sides of the thickness direction of the circuit board 40, and adjacent sub-coil segments 23 connected through the through holes 41. The sine and cosine coils are formed by traces at the top and bottom of the circuit board 40, and these traces are connected through the through holes 41. Therefore, the top traces and the bottom traces are connected through the through holes 41.

[0049] In some embodiments, the center distance between two adjacent through holes 41 along the length of the circuit board 40 is L1, where L1 ≥ 0.15 mm. This configuration satisfies the processing requirements of the receiving coil 20, thereby facilitating the realization of the receiving coil 20's functionality.

[0050] In some embodiments, the diameter of the through hole 41 is L2, the extension length of the receiving coil 20 in the length direction of the circuit board 40 is L3, and the number of through holes 41 is X. L2, L3, and X satisfy: X < (L3 + 0.15) / (L2 + 0.15). By limiting the number of through holes 41 as described above, it is possible to avoid an excessive number of through holes, which would increase the production cost of the position sensor 1 and hinder its mass production.

[0051] In some embodiments, the number of receiving coils 20 is Y, and the receiving coils 20 include M first coils 21 and M second coils 22, wherein Y and M satisfy: Y < (L3 + 0.15) / ((L2 + 0.15) * 2M). By limiting the above range, it is possible to avoid having too many receiving coils 20, which would occupy too much space and increase the production cost of the position sensor 1, thus hindering the mass production of the position sensor 1.

[0052] In some embodiments, the number of first coils 21 and second coils 22 is 2Y. This limitation avoids an excessive number of through holes 41, which would increase the production cost of the position sensor and hinder mass production. Similarly, this limitation also avoids an excessive number of first coils 21 and second coils 22, which would occupy too much space and increase the production cost of the position sensor 1, thus hindering mass production.

[0053] In some embodiments, each first coil 21 and each second coil 22 has Y starting points. These starting points enable the first coil 21 and 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 a sine coil or a cosine coil, and the sine coil in this application has two vertices, as does the cosine coil.

[0054] In some embodiments, 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)°. With this configuration, the phase difference allows the first coil 21 and the second coil 22 to jointly provide complete information about the displacement. By measuring the amplitude and phase difference of the first coil 21 and the second coil 22, the measured displacement can be accurately calculated, thereby improving measurement accuracy.

[0055] In this application, the circuit board 40 is also equipped with an LC filter circuit, which can reduce voltage surges and thus extend the service life of the position sensor 1.

[0056] As shown in Table 1 and Figure 5, in this application, the receiving coil 20 is set into two groups, one with 8 pole pairs and the other with 9 pole pairs. The number of pole pairs in the two groups of receiving coils 20 has no common divisor. The target component 30 is set to travel a distance of 360 mm, which is divided into 360 equal parts, each 1 mm in length. The 8-pole coil is divided into 8 groups of data, each with 45 points, and the 9-pole coil is divided into 9 groups of data, each with 40 points. For every 1 mm advance along the 360 ​​mm length, the absolute position is obtained by reading the positions of the 8-pole and 9-pole coils, as shown in Table 1. The absolute position is calculated as the value of the 8-pole coil × 8 + the value of the 9-pole coil × 9 at each L position, with no overlapping points at any position. In Figure 5, the black lines represent the 8-pole coils, and the gray lines represent the 9-pole coils.

[0057] Table 1

[0058] According to a second aspect of this application, as shown in FIG6, a sensor assembly 100 is provided, including the position sensor 1 described above.

[0059] According to a third aspect of this application, as shown in FIG7, a motor 200 is also provided. The motor 200 includes: a primary component 210; a secondary component 220; and the aforementioned position sensor 1. The primary component 210 and the secondary component 220 move relative to each other along the length direction of the position sensor 1, and the position sensor 1 is used to detect the relative movement.

[0060] According to a fourth aspect of this application, as shown in FIG8, a vehicle 300 is also provided, including the motor 200 as described above.

[0061] The position sensor 1 in this embodiment includes: a first coil group 11; and a second coil group 12. The first coil group 11 and the second coil group 12 are arranged in a one-to-one correspondence, and one group of the second coil groups 12 has a pole pair number of 'a', while the other group has a pole pair number of 'b', and 'a' and 'b' have no common divisor. 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 more, the number of reading position points is more, thereby increasing the detection accuracy of the position sensor 1 and meeting the user's needs.

Claims

1. A position sensor (1) for determining the position of a moving body, comprising: First coil group (11); The second coil group (12) is arranged at an interval from the first coil group (11); 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. The condition a and b satisfy the following: the greatest common divisor of a and b is 1.

2. The position sensor (1) according to claim 1, wherein, Both the first coil group (11) and the second coil group (12) further include a transmitting coil (10).

3. The position sensor (1) according to claim 1 or 2, wherein, The receiving coil (20) includes a first coil (21) and a second coil (22), wherein the first coil (21) of the first coil group (11) and the second coil (22) of the first coil group (11) are in different phases, and the first coil (21) of the second coil group (12) and the second coil (22) of the second coil group (12) are in different phases.

4. The position sensor (1) according to claim 3, wherein, The phase difference between the first coil (21) and the second coil (22) is 90°.

5. The position sensor (1) according to claim 3 or 4, wherein, The first coil (21) and the second coil (22) have the same period.

6. The position sensor (1) according to any one of claims 3-5, wherein, The first coil (21) includes a sine coil, and the second coil (22) includes a cosine coil, or the first coil (21) includes a cosine coil and the second coil (22) includes a sine coil.

7. The position sensor (1) according to any one of claims 1-6, wherein, The position sensor (1) also includes a target component (30); The target component (30) is used to move in correspondence with the moving body, and the target component (30) can move relative to the receiving coil (20) to generate an eddy current effect; The target element (30) covers at least half a cycle of the receiving coil (20) along the length direction of the position sensor (1).

8. The position sensor (1) according to claim 7, wherein, The position sensor (1) includes two target components (30), which are respectively configured to correspond one-to-one with the first coil group (11) and the second coil group (12).

9. The position sensor (1) according to claim 8, wherein, The two target components (30) move simultaneously along the length direction of the position sensor (1).

10. The position sensor (1) according to claim 9, wherein, During the movement of the two target components (30), one end of one target component (30) is aligned with one end of the other target component (30) in the length direction of the position sensor (1), and / or the other end of one target component (30) is aligned with the other end of the other target component (30) in the length direction of the position sensor (1).

11. The position sensor (1) according to any one of claims 1-10, wherein the position sensor (1) further comprises a sensor group, the sensor group comprising at least one first coil group (11) and at least one second coil group (12).

12. The position sensor (1) according to claim 11, wherein, The position sensor (1) includes a plurality of the sensor groups.

13. The position sensor (1) according to any one of claims 1-12, the position sensor (1) further comprising a circuit board (40), wherein the first coil group (11) and the second coil group (12) are configured to be formed on the circuit board (40).

14. The position sensor (1) according to claim 13, wherein, The circuit board (40) has multiple through holes. The first coil (21) and the second coil (22) include multiple sub-coil segments (23). Two adjacent sub-coil segments (23) are located on opposite sides of the thickness direction of the circuit board (40), and two adjacent sub-coil segments (23) are connected through the through holes.

15. The position sensor (1) according to claim 14, wherein, Along the length of the circuit board (40), the center distance between two adjacent through holes is L1, where L1 ≥ 0.15 mm.

16. The position sensor (1) according to claim 14 or 15, wherein, The diameter of the through hole is L2, the extension length of the receiving coil (20) in the length direction of the circuit board (40) is L3, and the number of through holes is X. The L2, L3, and X satisfy the condition: X < (L3 + 0.15) / (L2 + 0.15).

17. The position sensor (1) according to claim 16, wherein, The number of receiving coils (20) is Y, and the receiving coils (20) include M first coils (21) and M second coils (22). The Y and M satisfy: Y < (L3 + 0.15) / ((L2 + 0.15) * 2M).

18. The position sensor (1) according to claim 17, wherein, The number of the first coil (21) and the second coil (22) is 2Y.

19. The position sensor (1) according to claim 18, wherein, Each of the first coil (21) and each of the second coils (22) has Y starting points.

20. The position sensor (1) according to claim 19, wherein, 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)°.

21. A sensor assembly (100) comprising the position sensor (1) according to any one of claims 1-20.

22. An electric motor (200), the electric motor comprising: Primary component (210); Secondary component (220); And the position sensor (1) according to claim 20; The primary component (210) and the secondary component (220) move relative to each other along the length direction of the position sensor (1), which is used to detect the relative movement.

23. A vehicle (300) comprising an electric motor (200) as claimed in claim 22.

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