A redundant inductive and magnetic angle detection device

Abstract

A kind of redundant inductive and magnetic angle detection device, including rotating shaft, rotor is connected on rotating shaft, and stator is connected coaxially in parallel with the rotor, at least one inductive detection unit is connected on the stator and at least one angle detection signal is output;The end of rotating shaft is connected with magnet, at least one Hall detection unit is arranged below the magnet and at least one angle detection signal is output.The measuring device provided by the utility model can still obtain reliable angle information through another detection mode when a kind of detection mode fails.And rotor, magnet rotates synchronously with rotating shaft, compact structure saves installation space, is conducive to miniaturization and light weight sensor integration, there is no rotating mechanical gap when measuring, and measurement precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of angle measuring devices, specifically a redundant inductive and magnetic induction type angle detection device. Background Technology

[0002] Traditional angle sensors include potentiometers, optical encoders, and some simple inductive or magnetic induction sensors. However, these sensors may experience reduced reliability and accuracy in harsh environments (such as high temperatures and strong electromagnetic interference), especially in safety-critical applications like automotive and aerospace, where system fault tolerance is crucial. Inductive and magnetic induction sensors have become widely used angle measurement technologies due to their high accuracy, stability, and non-contact measurement capabilities. Inductive sensors offer good resistance to electromagnetic interference and temperature stability, while magnetic induction sensors enable non-contact measurement, reducing mechanical wear and increasing sensor lifespan. By combining inductive and magnetic induction technologies to create redundant angle sensors, not only is measurement accuracy improved, but the system's fault tolerance and reliability are also enhanced.

[0003] A search revealed existing technical documents on redundant angle measurement devices. For example, the utility model patent announcement with publication number "CN209355861U" entitled "A Redundant Hall and Inductive Steering Wheel Angle Sensor" discloses a redundant Hall and inductive steering wheel angle sensor, including a rotor and a stator coaxially arranged; the stator includes an excitation coil, a receiving coil, and a processing circuit; both the excitation coil and the receiving coil are connected to the processing circuit, which outputs two inductive angle signals; it also includes a magnet that rotates driven by the rotor via a driven structure, with a bipolar Hall chip positioned at a corresponding position along the magnet's rotation axis; the bipolar Hall chip includes interconnected Hall elements and an output circuit, which outputs two Hall angle signals; one of the inductive angle signals and one of the Hall angle signals are transmitted as one set of data to a computing unit, and the other inductive angle signal and another Hall angle signal are transmitted as another set of data to a different computing unit.

[0004] For example, the invention patent publication document with publication number "CN106679560A" entitled "An Electromagnetic Induction Torque Angle Sensor" discloses a sensor, specifically an electromagnetic induction torque angle sensor. This invention includes a PCB board, an input rotor, and an output rotor. The input end of the input shaft signal acquisition unit on the PCB board is connected to a first rotation angle, and the output end outputs a first angle signal. The input end of the output shaft signal acquisition unit is connected to a second rotation angle, and the output end outputs a second angle signal. The input end of the signal processing unit receives the first angle signal and the second angle signal. The first angle signal and the Hall angle signal acquired by the Hall sensor are used to obtain the steering wheel angle signal through a vernier algorithm. The signal processing unit outputs a torque signal. At least one anti-interference layer is provided on the layer between the layer containing the input shaft signal acquisition unit and the layer containing the output shaft signal acquisition unit. In the aforementioned prior art solutions, redundant angle measurement sensors all provide inductive and electromagnetic redundant measurement units. However, their structural design is relatively dispersed, utilizing too many intermediate transmission structures, resulting in limited integration; and the intermediate transmission mechanism inevitably has certain gaps, thus affecting measurement accuracy. Therefore, it is necessary to solve the technical problems of low integration and low precision in existing technologies. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a redundant inductive and magnetic induction angle detection device, including a rotating shaft, a rotor connected to the rotating shaft, and a stator coaxially and parallel to the rotor. At least one inductive detection unit is connected to the stator and outputs at least one angle detection signal. A magnet is connected to the end of the rotating shaft, and at least one Hall effect detection unit is installed below the magnet and outputs at least one angle detection signal.

[0006] Furthermore, the inductive detection unit includes an excitation coil and two receiving coils disposed on the stator, and the excitation coil and the two receiving coils are electrically connected to the inductive detection chip disposed on the stator.

[0007] Furthermore, a Hall detection chip is provided on the Hall detection unit.

[0008] Furthermore, a shield is also connected to the rotation shaft between the stator and the magnet, and the axial projection area of ​​the shield is not less than the area of ​​the magnet and the Hall detection unit.

[0009] Furthermore, the inductive detection chip uses the ZMID520X chip, and the inductive detection chip uses the MLX9037X chip.

[0010] Furthermore, pin 1 of the ZMID520X chip is left floating; pins 2 and 6 are both grounded; pin 3 is grounded via the third capacitor C3; pin 4 is connected to one end of the ninth capacitor C9 and one end of the third resistor R3, with the other end of the ninth capacitor C9 grounded and the other end of the third resistor R3 grounded via the seventh capacitor C7; pin 5 is grounded via the fourth capacitor C4; pin 7 is connected to one end of the fifth capacitor C5 and one end of the sixth capacitor C6, with the other ends of the fifth capacitor C5 and the sixth capacitor C6 grounded; pin 8 is connected to one end of the first resistor R1, with the other end of the first resistor R1 connected to the first capacitor C1 grounded and one end of the second resistor R2; pin 9 is connected to one end of the second resistor R2, with the other end of the second resistor R2... Pins 8 and 9 are connected to the ground of the second capacitor C2 and one end of the first resistor R1, respectively. Pin 10 is connected to the ground via the eighth capacitor R8. Pin 11 is connected to one end of the tenth capacitor C10 and pin 12, with the other end of the tenth capacitor C10 grounded. Pin 12 is connected to one end of the eleventh capacitor C11 and pin 11, with the other end of the eleventh capacitor C11 grounded. Pins 11 and 12 are connected to the two ends of the receiving coil. Pin 13 is connected to one end of the twelfth capacitor C12 and pin 14, with the other end of the twelfth capacitor C12 grounded. Pin 14 is connected to one end of the thirteenth capacitor C13 and pin 13, with the other end of the thirteenth capacitor C13 grounded. Pins 13 and 14 are connected to the two ends of the receiving coil.

[0011] Furthermore, pin 1 of the MLX9037X chip is grounded via capacitor C16; pins 4, 13, and 14 are all grounded; pin 9 is grounded via capacitor C19; pins 5, 7, and 12 are all grounded; pin 3 is connected to one end of resistor R8 and one end of capacitor C15, the other end of resistor R8 is connected to one end of capacitor C14 and one end of voltage VDD, and the other end of capacitor C15 is connected to one end of capacitor C18; pins 2 and 16 are connected to one end of capacitor C15, one end of capacitor C18, the other end of capacitor C14, one end of capacitor C17, VSS, and ground; pin 15 is connected to the other end of capacitor C18 and... One end of resistor R5 is connected to the other end of capacitor C17 and the output terminal, respectively. Pin 11 is connected to one end of capacitor C21 and one end of resistor R9, respectively. The other end of capacitor C21 is connected to one end of capacitor C22, respectively. Resistor R9 is connected to one end of capacitor C20 and the voltage VDD terminal, respectively. Pins 10 and 8 are connected to the other end of capacitor C21, one end of capacitor C23, one end of capacitor C20, one end of capacitor C22, the VSS terminal, and ground, respectively. Pin 6 is connected to the other end of capacitor C23 and one end of resistor R7, respectively. The other end of resistor R7 is connected to the other end of capacitor C22 and the output terminal, respectively.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects: Using the measuring device provided by this utility model, reliable angle information can still be obtained through another detection method even if one detection method fails. Furthermore, the rotor and magnet rotate synchronously with the rotating shaft, resulting in a compact structure that saves installation space, which is beneficial for miniaturized and lightweight sensor integration. The absence of mechanical backlash during measurement leads to higher measurement accuracy. Attached Figure Description

[0013] Figure 1 : Structural principle diagram of the measuring device;

[0014] Figure 2 Circuit diagram of the inductance detection unit;

[0015] Figure 3 : Circuit diagram of the Hall effect detection unit. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 As shown. A redundant inductive and magnetic induction angle detection device includes a rotating shaft 1, a rotor 2 connected to the rotating shaft 1, and a stator 3 coaxially and parallel to the rotor 2. At least one inductive detection unit 5 is connected to the stator 3 and outputs at least one angle detection signal. A magnet 4 is connected to the end of the rotating shaft 1, and at least one Hall effect detection unit 6 is installed below the magnet 4 and outputs at least one angle detection signal.

[0018] When the rotating shaft 1 rotates, it synchronously drives the rotor 2 and magnet 4 to rotate. The rotor 2 is made of conductive and magnetically conductive material. When the rotor 2 rotates, the inductive detection unit 5 detects and outputs an angle signal based on the rotation angle of the rotor 2; when the magnet 4 rotates, the Hall effect detection unit 6 also detects the rotation angle and outputs an angle detection signal. The rotation of both is synchronous, with no mechanical backlash error, resulting in high measurement accuracy and a compact structural design. Both the inductive detection unit 5 and the Hall effect detection unit 6 employ non-contact angle detection, making them suitable for operation in harsh environments such as dusty, high-humidity, and vibrating conditions. If one detection unit fails, the other can still detect normally, thus achieving a redundant design. Before the angle signals output by the two detection units enter subsequent processing, they undergo differential amplification and filtering circuits to eliminate noise and environmental interference. Especially in inductive signal processing, differential design improves anti-interference capabilities. The sensor fuses the angle data from the magnetic induction and inductive sensors, using weighted averaging, redundant detection, or other data processing algorithms to improve data accuracy and reliability.

[0019] In a more preferred embodiment, the inductive detection unit 5 includes an excitation coil TX1 and two receiving coils RXSIN1 and RXCOS1 disposed on the stator 3. The excitation coil TX1 and the two receiving coils RXSIN1 and RXCOS1 are electrically connected to an inductive detection chip U1 disposed on the stator 3. An alternating magnetic field is generated between the excitation coil and the receiving coil through electromagnetic induction. When the rotor 2 rotates, it changes the magnetic flux between the excitation coil and the receiving coil. The angle is determined by detecting the change in inductance on the receiving coil. In this embodiment, the inductive detection unit 5 is designed as a differential structure, using multiple receiving coils for differential detection to reduce the influence of external environmental interference on the signal.

[0020] In a more preferred embodiment, the Hall detection unit 6 is equipped with a Hall detection chip U2. The magnetic induction detection unit, based on a Hall effect sensor, is used to detect changes in the magnetic field to determine the rotation angle. By mounting a permanent magnet on the rotating shaft, a stable magnetic field distribution can be generated during rotation. When the rotating shaft 2 rotates, the direction or position of the magnet also changes, thereby altering the direction and intensity of the magnetic field. The Hall detection chip U2 is used to detect changes in the intensity and direction of the magnetic field generated by the permanent magnet. Multiple Hall sensors within it are placed in different directions to capture the magnetic field components along the three axes (X, Y, and Z), which are used to calculate the rotation angle.

[0021] In a more preferred embodiment, since all detection units in this embodiment are coaxially connected to the rotation shaft 2, the structure is compact, but electromagnetic interference between them may exist. For example, the magnetic field of the inductive detection unit 5 may affect the magnetic field signal judgment of the Hall detection unit 6. To solve this problem, a shield 7 is also connected to the rotation shaft 1 between the stator 3 and the magnet 4. The axial projection area of ​​the shield 7 is not less than the area of ​​the magnet 4 and the Hall detection unit 6. The shield 7 is supported by a magnetically blocking material and has a certain area to prevent the magnetic field of the inductive detection unit 5 from interfering with the Hall detection unit 6.

[0022] In this embodiment, the inductive detection chip U1 is a ZMID520X chip, and the inductive detection chip U1 is an MLX9037X chip.

[0023] Figure 2The circuit diagram of the inductance detection unit is shown. Pin 1 of the ZMID520X chip is left floating; pins 2 and 6 are grounded; pin 3 is grounded via capacitor C3; pin 4 is connected to one end of capacitor C9 and one end of resistor R3, with the other end of capacitor C9 grounded and the other end of resistor R3 grounded via capacitor C7; pin 5 is grounded via capacitor C4; pin 7 is connected to one end of capacitor C5 and one end of capacitor C6, with the other ends of capacitors C5 and C6 grounded; pin 8 is connected to one end of resistor R1, with the other end of resistor R1 connected to capacitor C1 and grounded, and one end of resistor R2; pin 9 is connected to one end of resistor R2, with the other end of resistor R2 connected to... Connect the second capacitor C2 to ground and one end of the first resistor R1. Pins eight and nine are connected to the two ends of the excitation coil TX1. Pin ten is grounded via the eighth capacitor R8. Pin eleven is connected to one end of the tenth capacitor C10 and pin twelfth, with the other end of the tenth capacitor C10 grounded. Pin twelfth is connected to one end of the eleventh capacitor C11 and pin eleventh, with the other end of the eleventh capacitor C11 grounded. Pins eleven and twelfth are connected to the two ends of the receiving coil RXSIN1. Pin thirteen is connected to one end of the twelfth capacitor C12 and pin fourteenth, with the other end of the twelfth capacitor C12 grounded. Pin fourteen is connected to one end of the thirteenth capacitor C13 and pin thirteenth, with the other end of the thirteenth capacitor C13 grounded. Pins thirteen and fourteenth are connected to the two ends of the receiving coil RXCOS1.

[0024] Figure 3The circuit diagram of the Hall effect detection unit is shown. Pin 1 of the MLX9037X chip is grounded via capacitor C16 (sixteenth capacitor); pins 4, 13, and 14 are all grounded; pin 9 is grounded via capacitor C19 (nineteenth capacitor); pins 5, 7, and 12 are all grounded; pin 3 is connected to one end of resistor R8 (eighth resistor) and one end of capacitor C15 (fifteenth capacitor); the other end of resistor R8 is connected to one end of capacitor C14 (fourteenth capacitor) and voltage VDD; the other end of capacitor C15 is connected to one end of capacitor C18 (eighteenth capacitor); pins 2 and 16 are connected to one end of capacitor C15 (fifteenth capacitor), one end of capacitor C18 (eighteenth capacitor), the other end of capacitor C14 (fourteenth capacitor), one end of capacitor C17 (seventeenth capacitor), VSS, and ground; pin 15 is connected to capacitor C18 (eighteenth capacitor). The other end of pin 11 is connected to one end of the 21st capacitor C21 and one end of the 9th resistor R9. The other end of the 21st capacitor C21 is connected to one end of the 22nd capacitor C22. The 9th resistor R9 is connected to one end of the 20th capacitor C20 and one end of the voltage VDD. Pins 10 and 8 are both connected to the other end of the 21st capacitor C21, one end of the 23rd capacitor C23, one end of the 20th capacitor C20, one end of the 22nd capacitor C22, the VSS terminal, and ground. Pin 6 is connected to the other end of the 23rd capacitor C23 and one end of the 7th resistor R7. The other end of the 7th resistor R7 is connected to the other end of the 22nd capacitor C22 and the output terminal.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A redundant inductive and magnetic induction type angle detection device, characterized in that, It includes a rotating shaft (1), a rotor (2) connected to the rotating shaft (1), and a stator (3) coaxially and parallel to the rotor (2). At least one inductive detection unit (5) is connected to the stator (3) and outputs at least one angle detection signal. A magnet (4) is connected to the end of the rotating shaft (1), and at least one Hall detection unit (6) is installed below the magnet (4) and outputs at least one angle detection signal.

2. The inductive and magnetic induction angle detection device as described in claim 1, characterized in that, The inductive detection unit (5) includes an excitation coil (TX1) and two receiving coils (RXSIN1, RXCOS1) disposed on the stator (3). The excitation coil (TX1) and the two receiving coils (RXSIN1, RXCOS1) are electrically connected to the inductive detection chip (U1) disposed on the stator (3).

3. The inductive and magnetic induction angle detection device as described in claim 2, characterized in that, The Hall detection unit (6) is provided with a Hall detection chip (U2).

4. The inductive and magnetic induction angle detection device as described in claim 3, characterized in that, A shield (7) is also connected to the rotating shaft (1) between the stator (3) and the magnet (4). The shield (7) has an axial projection area of ​​not less than that of the magnet (4) and the Hall detection unit (6).

5. The inductive and magnetic induction angle detection device as described in claim 4, characterized in that, The inductive detection chip (U1) uses the ZMID520X chip, and the inductive detection chip (U1) uses the MLX9037X chip.

6. The inductive and magnetic induction angle detection device as described in claim 5, characterized in that, Pin 1 of the ZMID520X chip is left floating; pins 2 and 6 are both grounded; pin 3 is grounded via capacitor C3; pin 4 is connected to one end of capacitor C9 and one end of resistor R3, with the other end of capacitor C9 grounded and the other end of resistor R3 grounded via capacitor C7; pin 5 is grounded via capacitor C4; pin 7 is connected to one end of capacitor C5 and one end of capacitor C6, with the other ends of capacitor C5 and capacitor C6 grounded; pin 8 is connected to one end of resistor R1, with the other end of resistor R1 connected to capacitor C1 grounded and one end of resistor R2; pin 9 is connected to one end of resistor R2, with the other end of resistor R2 connected to capacitor C2 grounded and... One end of the first resistor R1, pins eight and nine are connected to the two ends of the excitation coil (TX1); pin ten is grounded via the eighth capacitor R8; pin eleven is connected to one end of the tenth capacitor C10 and pin twelfth, and the other end of the tenth capacitor C10 is grounded; pin twelfth is connected to one end of the eleventh capacitor C11 and pin eleventh, and the other end of the eleventh capacitor C11 is grounded; pins eleven and twelve are connected to the two ends of the receiving coil (RXSIN1); pin thirteen is connected to one end of the twelfth capacitor C12 and pin fourteenth, and the other end of the twelfth capacitor C12 is grounded; pin fourteen is connected to one end of the thirteenth capacitor C13 and pin thirteenth, and the other end of the thirteenth capacitor C13 is grounded; pins thirteen and fourteenth are connected to the two ends of the receiving coil (RXCOS1).

7. The inductive and magnetic induction angle detection device as described in claim 6, characterized in that, The MLX9037X chip has pin 1 grounded via capacitor C16; pins 4, 13, and 14 are all grounded; pin 9 is grounded via capacitor C19; pins 5, 7, and 12 are all grounded; pin 3 is connected to one end of resistor R8 and one end of capacitor C15, the other end of resistor R8 is connected to one end of capacitor C14 and one voltage VDD, and the other end of capacitor C15 is connected to one end of capacitor C18; pins 2 and 16 are connected to one end of capacitor C15, one end of capacitor C18, the other end of capacitor C14, one end of capacitor C17, the VSS terminal, and ground; pin 15 is connected to the other end of capacitor C18 and the fifth capacitor... One end of resistor R5 and the other end of the fifth resistor R5 are connected to the other end of the seventeenth capacitor C17 and the output terminal, respectively; pin eleven is connected to one end of the twenty-first capacitor C21 and one end of the ninth resistor R9, the other end of the twenty-first capacitor C21 is connected to one end of the twenty-second capacitor C22, and the ninth resistor R9 is connected to one end of the twentieth capacitor C20 and one voltage VDD terminal, respectively; pins ten and eight are both connected to the other end of the twenty-first capacitor C21, one end of the twenty-third capacitor C23, one end of the twentieth capacitor C20, one end of the twenty-second capacitor C22, the VSS terminal, and ground, respectively; pin six is ​​connected to the other end of the twenty-third capacitor C23 and one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the other end of the twenty-second capacitor C22 and the output terminal, respectively.

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