High-precision gear disc absolute position magnetic encoder measuring system

Abstract

The invention discloses a high-precision gear disc absolute position magnetic encoder measuring system, and relates to the technical field of encoders, the measuring system comprises a magnetic sensor, a gear disc assembly and a magnetic mechanism, the magnetic sensor is placed on the upper side of a gear disc and is located between the gear disc and the magnetic mechanism; the gear disc assembly is composed of at least two gears which are coaxially arranged side by side. The magnetic mechanism is made of a permanent magnet material, and when the gear disc rotates, the magnetic mechanism and the gear disc together provide a magnetic field for the middle magnetic sensor; the high-precision gear disc absolute position magnetic encoder measurement system provided by the invention is simple and accurate in implementation mode and high in anti-interference performance; the gear in the gear disc assembly is mature in process and suitable for large-scale mechanical production, and miniaturization and large-scale automatic production can be achieved more easily.

Description

Technical Field

[0001] The invention relates to the technical field of encoders, in particular to a high-precision gear plate absolute position magnetic encoder measurement system. Background Art

[0002] The commonly used absolute encoders at present are usually implemented by using a method in which the inner and outer code channels differ by one magnetic pole pair. Since this multi-pole magnetic encoder disk has very high requirements for the magnetization process and the cost is high, the inductive coil absolute position encoder measurement system has developed rapidly. This type of measurement system uses PCB technology to realize dense coil windings, which are composed of a stator and a rotor, both of which are flat rings. This large hollow structure is easy to pass through shafts, slip rings, optical fibers and cables. There are power supply circuits and angle signal processing circuits in the stator. After power-on, the stator outputs the absolute angle value of the rotor relative to the stator position. Although this inductive absolute position encoder measurement system can reduce the thickness of the encoder disk, reduce weight, and has low power consumption, it has the advantages of complex configuration and subsequent signal processing circuits. Therefore, people are in urgent need of an absolute position magnetic encoder measurement system with high precision, low cost and conducive to large-scale automated production. Summary of the invention

[0003] The object of the present invention is to provide a high-precision gear plate absolute position magnetic encoder measurement system to solve the problems raised in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: a high-precision gear plate absolute position magnetic encoder measurement system, the measurement system comprising a magnetic sensor, a gear plate assembly and a magnetic mechanism; The magnetic sensor is placed on the upper side of the gear plate, in the middle of the gear plate and the magnetic mechanism; The gear plate assembly is composed of at least two gears placed coaxially side by side; The magnetic mechanism is a permanent magnetic material. When the gear plate rotates, the magnetic mechanism and the gear plate together provide a magnetic field for the magnetic sensor in the middle.

[0005] Furthermore, the magnetic sensor is placed on the upper side of the gear plate and is located in the middle position between the gear plate and the magnetic mechanism. As the gear rotates around the axis, the magnetic sensor can receive the magnetic field jointly exerted by the magnetic mechanism and the gear plate. The placement of the magnetic sensor includes two placement methods, one is patch placement, and the other is insertion placement from the side. When placing the magnetic sensor, the placement position and placement method of the magnetic sensor are selected according to the space conditions.

[0006] Furthermore, the number of the magnetic sensors is one or is consistent with the number of gears in the gear plate assembly; if the number of magnetic sensors is one, the magnetic sensor is placed directly above the gear plate. At this time, the number of sensing unit groups contained in one magnetic sensor is consistent with the number of gears, and each sensing unit group senses the magnetic field signal of each gear respectively; if the number of magnetic sensors is consistent with the number of gears in the gear plate assembly, each magnetic sensor includes a sensing unit group. At this time, each magnetic sensor is placed above its corresponding gear plate and senses the magnetic field signal of the corresponding gear plate respectively.

[0007] Furthermore, each sensing unit group includes two or more sensing units.

[0008] Furthermore, the magnetic sensor is a sensor that is highly integrated with Hall, magnetoresistive and CMOS circuits; such magnetoresistive sensors are highly integrated with CMOS circuits, with small errors and higher precision; or it is a discrete Hall sensor or a magnetoresistive sensor based on magnetoresistive effect, which is used in conjunction with discrete electronic components for signal processing, such as operational amplifiers, ADCs, MCUs or signal conditioning chips; and when the number of magnetic sensors is greater than one, the type of each magnetic sensor can select one of the above two magnetic sensor types.

[0009] Furthermore, the gears in the gear plate assembly are soft magnetic wheel-shaped structures that rotate along the axis, including at least two gears placed coaxially side by side, and the inner and outer diameters of the gears are consistent, and the materials are consistent. The difference between different gears is that the number of teeth on the gears differs by one.

[0010] Furthermore, the gears in the gear plate assembly are made of soft magnetic material or semi-hard magnetic material. Such gears have a certain magnetic permeability and have a magnetic field guiding effect on the magnetic mechanism. In addition, due to the different gaps between the tooth tops and tooth valleys of the gears and the magnetic sensors, during the rotation of the gears, the magnetic flux of the magnetic circuit changes with the rotation of the gears. When the tooth tops pass through the magnetic sensors, due to the small gap between the tooth tops and the magnetic sensors, the magnetic flux is dense and the magnetic field received by the magnetic sensor is also high. When the tooth valleys pass through the magnetic sensors, due to the large gap between the tooth valleys and the sensors, the magnetic flux is loose and the magnetic field received by the magnetic sensor is also low. As the gears rotate, the magnetic field changes periodically accordingly.

[0011] Furthermore, the magnetic mechanism is made of permanent magnetic material, and when the gear plate rotates, it provides a magnetic field for the magnetic sensor in the middle together with the gear plate. The magnetic sensor uses the induction unit group distributed inside the sensor to sense different gears and the magnetic mechanism to form a magnetic field signal. Permanent magnetic materials, also known as hard magnetic materials, refer to magnetic materials that can retain their strong magnetism for a very long period of time after being magnetized in some external magnetic field and have a high coercive force. Permanent magnetic materials were discovered and applied the earliest, and are also the most diverse, rapidly developing and widely used magnetic materials currently.

[0012] Furthermore, the magnetic sensor receives the magnetic field change signal formed together with the magnetic mechanism during the rotation of the gear disk around the axis, and the magnetic field change signal is output in the form of a magnetic angle, and the magnetic angle is obtained by two differential magnetic field signals respectively; using the magnetic angle signal for information transmission has the advantages of non-contact, high precision, high anti-interference, etc. The magnetic properties of magnetic materials will change after they are exposed to external heat, light, pressure, radiation, etc. This material can be used to make various sensors with good reliability and high sensitivity. This type of sensor uses magnetic materials as its sensitive element, and converts the changes in the magnetic properties of the sensitive element caused by external factors such as magnetic field, current, stress strain, temperature, light, etc. into electrical signals. The device that detects the corresponding physical quantity in this way is called a magnetic sensor. Magnetic sensors measure physical parameters such as displacement, speed, acceleration, etc. of objects by sensing changes in magnetic fields. They are widely used in many fields, including: Automobile industry: These sensors are used to monitor engine speed, vehicle Speed, as well as the position of the accelerator, brake and clutch; Industrial automation: In automated production lines, magneto-electric inductive sensors are used to measure the speed of webs, the feed speed of paper, and the displacement of servo motors in automatic cutting machines; Aerospace: In the aerospace field, these sensors are used for attitude control of aircraft, rockets and missiles, as well as navigation, control and attitude measurement of spacecraft; Mechanical industry: In robotics, magneto-electric inductive sensors are used to monitor the position, speed and acceleration of robots for precise control; Medical industry: In medical equipment, such as blood pressure monitors and magnetic resonance imaging equipment, magneto-electric inductive sensors are used in diagnostic and treatment processes.

[0013] Furthermore, the magnetic angle is obtained from a magnetic field signal. The magnetic sensor includes a sensing unit group, each sensing unit group includes two or more sensing units, and the sensing unit is a receiving unit for receiving external magnetic field signals. During the rotation of the wheel around the axis, the sensing units inside the sensor respectively receive the magnetic field signals at their respective positions, and the magnetic angle is obtained from the magnetic field signal. Or if there are more sensing units, differential magnetic field signals can be obtained by pairwise differentiation, and the magnetic angle is obtained based on the differential magnetic field signals.

[0014] Furthermore, different gears will eventually obtain different magnetic angles. The difference obtained by subtracting different magnetic angles is the absolute magnetic angle. The absolute magnetic angle varies between 0 and 360 degrees, and the absolute magnetic angle changes linearly with the rotation angle of the gear. When the gear disk rotates around the axis to different angles, the absolute magnetic angle is unique, from which the absolute position of the gear disk can be inferred.

[0015] Furthermore, the gear disc assembly uses a gear with a module p to obtain a high-precision magnetic angle; after the magnetic angle is calculated, the magnetic angle is corrected for magnetic deflection, dynamically compensated and optimized; gears with higher modules have higher load-bearing capacity and better noise performance, and are suitable for high-load, high-speed transmission systems; gears with lower modules have higher precision and smaller tooth surface contact stress, and are suitable for systems with high requirements for transmission precision; therefore, the selection of gears with lower modules can relatively improve the angular accuracy of the encoding, but the load-bearing capacity and noise performance of gears with low modules are relatively weaker than those of gears with high modules, so in the actual design, it is necessary to comprehensively consider multiple factors such as the encoding accuracy, transmission power, rotation speed, and stress conditions of the gear, and reasonably select the module of the gear to achieve the best effect.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The high-precision gear plate absolute position magnetic encoder measurement system proposed in the present invention is simple and accurate in implementation, and uses magnetic angle signals for information transmission with the advantages of non-contact, high precision, and high anti-interference. The system can analyze the position of the gear plate through the absolute magnetic angle, and the absolute magnetic angle changes as the gear plate rotates. The absolute magnetic angle is unique when the gear plate rotates around the axis to different angles, thereby accurately inferring the absolute position of the gear plate. The gears in the gear plate assembly have mature technology and are easier to achieve miniaturization and large-scale automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A relative structural schematic diagram of a high-precision gear plate absolute position magnetic encoder measurement system of the present invention; Figure 2 A schematic diagram of the distribution of magnetic lines of force between the gear and the magnetic mechanism of a high-precision gear plate absolute position magnetic encoder measurement system of the present invention; Figure 3 It is a schematic diagram of differential signal distribution corresponding to two gear plates in an embodiment of a high-precision gear plate absolute position magnetic encoder measurement system of the present invention; Figure 4 A distribution diagram of the change of magnetic angle with the gear rotation angle in an embodiment of a high-precision gear plate absolute position magnetic encoder measurement system of the present invention; Figure 5This is a schematic diagram of absolute magnetic angle distribution in an embodiment of a high-precision gear plate absolute position magnetic encoder measurement system of the present invention; In the figure: 1. Magnetic sensor; 2.1. (n+1)-tooth gear; 2.2. n-tooth gear; 3. Magnetic mechanism. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1-Figure 5 As shown, the present invention provides a technical solution, a high-precision gear plate absolute position magnetic encoder measurement system, the measurement system includes a magnetic sensor, a gear plate assembly and a magnetic mechanism; The magnetic sensor is placed on the upper side of the gear plate, in the middle of the gear plate and the magnetic mechanism; The gear plate assembly is composed of at least two gears placed coaxially side by side; The magnetic mechanism is a permanent magnetic material. When the gear plate rotates, the magnetic mechanism and the gear plate together provide a magnetic field for the magnetic sensor in the middle.

[0020] The magnetic sensor is placed on the upper side of the gear plate and is located in the middle of the gear plate and the magnetic mechanism. As the gear rotates around the axis, the magnetic sensor can receive the magnetic field jointly exerted by the magnetic mechanism and the gear plate. The placement of the magnetic sensor includes two placement methods, one is patch placement, and the other is insertion placement from the side. When placing the magnetic sensor, the placement position and placement method of the magnetic sensor are selected according to the space conditions.

[0021] The number of the magnetic sensors is one or is consistent with the number of gears in the gear plate assembly; if the number of magnetic sensors is one, the magnetic sensor is placed directly above the gear plate. At this time, the number of sensing unit groups contained in one magnetic sensor is consistent with the number of gears, and each sensing unit group senses the magnetic field signal of each gear respectively; if the number of magnetic sensors is consistent with the number of gears in the gear plate assembly, each magnetic sensor includes one sensing unit group. At this time, each magnetic sensor is placed above its corresponding gear plate and senses the magnetic field signal of the corresponding gear plate respectively.

[0022] Each sensing unit group includes two or more sensing units.

[0023] The magnetic sensor is a sensor that is highly integrated with Hall, magnetoresistive and CMOS circuits; such magnetoresistive sensors are highly integrated with CMOS circuits, with small errors and higher precision; or it is a discrete Hall sensor or a magnetoresistive sensor based on magnetoresistive effect, which is used in conjunction with discrete electronic components for signal processing, such as operational amplifiers, ADCs, MCUs or signal conditioning chips; and when the number of magnetic sensors is greater than one, the type of each magnetic sensor can select one of the above two magnetic sensor types.

[0024] The gears in the gear plate assembly are soft magnetic wheel-shaped structures rotating along the axis, including at least two coaxially placed gears side by side, and the inner and outer diameters of the gears are consistent, and the materials are consistent. The difference between different gears is that the number of teeth of the gears differs by one.

[0025] The gears in the gear plate assembly are made of soft magnetic material or semi-hard magnetic material. Such gears have a certain magnetic permeability and have a magnetic field guiding effect on the magnetic mechanism. In addition, due to the different gaps between the tooth top, tooth valley and magnetic sensor of the gear, during the rotation of the gear, the magnetic flux of the magnetic circuit changes with the rotation of the gear; when the tooth top passes through the magnetic sensor, due to the small gap between the tooth top and the magnetic sensor, the magnetic flux is dense and the magnetic field received by the magnetic sensor is also high; when the tooth valley passes through the magnetic sensor, due to the large gap between the tooth valley and the sensor, the magnetic flux is loose and the magnetic field received by the magnetic sensor is also low; as the gear rotates, the magnetic field changes periodically accordingly.

[0026] The magnetic mechanism is made of permanent magnetic material, and when the gear plate rotates, it and the gear plate provide a magnetic field for the magnetic sensor in the middle. The magnetic sensor uses the induction unit group distributed inside the sensor to respectively sense different gears and the magnetic mechanism to form a magnetic field signal; Permanent magnetic materials, also known as hard magnetic materials, refer to magnetic materials that can retain their strong magnetism for a very long period of time after being magnetized in some external magnetic field and have a high coercive force. Permanent magnetic materials were the first to be discovered and applied, and are also the magnetic materials that are currently diverse, rapidly developing and widely used.

[0027] The magnetic sensor receives a magnetic field change signal formed together with the magnetic mechanism during the rotation of the gear disk around the axis, and the magnetic field change signal is output in the form of a magnetic angle after various calculations.

[0028] The magnetic angle is obtained from a magnetic field signal. The magnetic sensor includes a sensing unit group. Each sensing unit group includes two or more sensing units. The sensing unit is a receiving unit for receiving external magnetic field signals. When the wheel rotates around the axis, the sensing units inside the sensor receive the magnetic field signals at their respective positions, and the magnetic angle is obtained from the magnetic field signal. If there are more sensing units, differential magnetic field signals can be obtained by pairwise differentiation, and the magnetic angle is obtained based on the differential magnetic field signals.

[0029] Different gears will eventually obtain different magnetic angles. The difference obtained by subtracting different magnetic angles is the absolute magnetic angle. The absolute magnetic angle varies between 0 and 360 degrees, and the absolute magnetic angle changes linearly with the rotation angle of the gear. When the gear disk rotates around the axis to different angles, the absolute magnetic angle is unique, from which the absolute position of the gear disk can be inferred.

[0030] The gear plate assembly uses a gear with a module p to obtain a high-precision magnetic angle; after the magnetic angle is calculated, the magnetic angle is compensated and optimized; gears with higher modules have higher load-bearing capacity and better noise performance, and are suitable for high-load, high-speed transmission systems; gears with lower modules have higher precision and smaller tooth surface contact stress, and are suitable for systems with high transmission precision requirements; therefore, the use of gears with lower modules can relatively improve the angular accuracy of the encoding, but the load-bearing capacity and noise performance of gears with low modules are relatively weaker than those of gears with high modules, so in the actual design, it is necessary to comprehensively consider multiple factors such as the encoding accuracy, transmission power, rotation speed, and stress conditions of the gear, and reasonably select the module of the gear to achieve the best effect.

[0031] Embodiment 1: A high-precision gear plate absolute position magnetic encoder measurement system, such as Figure 1 As shown, the measuring system includes a magnetic sensor 1, a gear plate assembly and a magnetic mechanism 3; The magnetic sensor 1 is placed on the upper side of the gear plate, in the middle of the gear plate and the magnetic mechanism 3; The gear plate assembly is composed of at least two gears placed coaxially side by side; The magnetic mechanism 3 is made of permanent magnetic material. When the gear plate rotates, the magnetic mechanism 3 and the gear plate together provide a magnetic field for the magnetic sensor 1 in the middle.

[0032] The magnetic sensor 1 is placed on the upper side of the gear plate and is located in the middle of the gear plate and the magnetic mechanism 3. As the double gears rotate around the axis, the magnetic sensor 1 can receive the magnetic field jointly exerted by the magnetic mechanism 3 and the gear plate. The placement of the magnetic sensor 1 includes two placement methods, one is patch placement, and the other is insertion placement from the side. When placing the magnetic sensor 1, the placement position and placement method of the magnetic sensor 1 are selected according to the space conditions. Here, patch placement is selected.

[0033] The composition structure of the magnetic sensor 1 includes two types, one of which is a sensor that is highly integrated with Hall, magnetoresistive and CMOS circuits. This type of magnetoresistive sensor is highly integrated with the CMOS circuit, has small errors and higher precision; the other is a discrete Hall sensor or a magnetoresistive sensor based on the magnetoresistive effect, which is combined with discrete electronic components for signal processing, such as operational amplifiers, ADCs, MCUs or signal conditioning chips; and the magnetic sensor 1 includes a sensing unit group for sensing the magnetic field signal of the corresponding gear.

[0034] The gears in the gear plate assembly are soft magnetic wheel-shaped structures that rotate along the axis, including two coaxially placed gears side by side, the two gears are respectively (n+1)-tooth gear 2.1 and n-tooth gear 2.2, for example: a 128-tooth gear and a 127-tooth gear; and the two gears have the same inner and outer diameters and the same material, and the difference between different gears is that the number of teeth of the gears differs by one.

[0035] The gears in the gear plate assembly are made of soft magnetic materials. Such gears have a certain magnetic permeability and have a magnetic field focusing and guiding effect on the magnetic field of the magnetic mechanism 3. Figure 2 As shown, Figure 2 The cross lines in represent the spatial domain, and due to the different gaps between the tooth top and the tooth valley of the gear and the sensor, the magnetic flux of the magnetic circuit changes with the rotation of the gear during the rotation of the gear; when the tooth top passes through the magnetic sensor 1, due to the small gap between the tooth top and the magnetic sensor 1, the magnetic flux is dense at this time, and the magnetic field received by the magnetic sensor 1 is also high; when the tooth valley passes through the magnetic sensor 1, due to the large gap between the tooth valley and the magnetic sensor 1, the magnetic flux is loose at this time, and the magnetic field received by the magnetic sensor 1 is also low; then as the gear rotates, the magnetic field changes periodically accordingly, and the magnetic field changes with the mechanical rotation angle of the gear as shown in Figure 3 shown.

[0036] The magnetic mechanism 3 is made of permanent magnetic material, and when the gear plate rotates, it and the gear plate provide a magnetic field for the magnetic sensor 1 in the middle. The magnetic sensor 1 uses the induction unit group distributed inside to sense the two gears and the magnetic mechanism 3 to form a magnetic field signal. Permanent magnetic materials, also known as hard magnetic materials, refer to magnetic materials that can retain their strong magnetism for a very long period of time and have a high coercive force after being magnetized in some external magnetic field.

[0037] The magnetic sensor 1 receives the magnetic field change signal formed by the magnetic mechanism 3 during the rotation of the gear disk around the axis, such as Figure 4 As shown, the magnetic field change signal is output in the form of a magnetic angle, and the magnetic angle is obtained from two differential magnetic field signals.

[0038] In the embodiment, the magnetic angle is obtained by a differential magnetic field signal; this embodiment includes two gears, and an integrated magnetic sensor is used to receive the magnetic field signal. The magnetic sensor includes two groups of sensing units. Each gear corresponds to a group of sensing units inside the magnetic sensor, and each group includes four sensing units. During the rotation of the wheel around the axis, the sensing units inside the magnetic sensor 1 receive the magnetic field signals at their respective positions respectively. The magnetic field signals of each group are differentiated pairwise to obtain differential magnetic field signals, and a magnetic angle is obtained based on the differential magnetic field signals.

[0039] The above two gears will eventually get two magnetic angles, and the difference between the two magnetic angles is the absolute magnetic angle, such as Figure 5 As shown, the absolute magnetic angle changes linearly with the gear rotation angle between 0 and 360 degrees; the absolute magnetic angle is unique when the gear plate rotates around the axis to different angles, from which the absolute position of the gear plate can be inferred.

[0040] In the gear plate assembly of this embodiment, two gears with a module p=0.4 are used to obtain a high-precision magnetic angle, and the angle accuracy can reach 0.02 degrees. After the magnetic angle is calculated, the magnetic angle is compensated and optimized; In the embodiment, the number of each group of sensing units is four in order to perform differential processing, thereby making the signal more resistant to interference.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-precision gear plate absolute position magnetic encoder measurement system, characterized in that: The measuring system includes a magnetic sensor, a gear plate assembly and a magnetic mechanism; The magnetic sensor is placed on the upper side of the gear plate, in the middle of the gear plate and the magnetic mechanism; The gear plate assembly is composed of at least two gears placed coaxially side by side; The magnetic mechanism is a permanent magnetic material. When the gear plate rotates, the magnetic mechanism and the gear plate together provide a magnetic field for the magnetic sensor in the middle; The magnetic sensor receives the magnetic field change signal formed together with the magnetic mechanism during the rotation of the gear disk around the axis. The magnetic field change signal is output in the form of a magnetic angle, and the magnetic angle is obtained by two differential magnetic field signals respectively; different gears will eventually obtain different magnetic angles, and the difference obtained by subtracting different magnetic angles is the absolute magnetic angle, which varies between 0 and 360 degrees, and the absolute magnetic angle varies linearly with the gear rotation angle; thereby, the absolute position of the gear disk can be inferred.

2. A high-precision gear plate absolute position magnetic encoder measurement system according to claim 1, characterized in that: The magnetic sensor is placed on the upper side of the gear plate and is located in the middle of the gear plate and the magnetic mechanism. As the gear rotates around the axis, the magnetic sensor can receive the magnetic field generated by the magnetic mechanism and the gear plate.

3. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 1, characterized in that: The number of the magnetic sensors is one or is consistent with the number of gears in the gear plate assembly; if the number of magnetic sensors is one, the magnetic sensor is placed directly above the gear plate. At this time, the number of sensing unit groups contained in one magnetic sensor is consistent with the number of gears, and each sensing unit group senses the magnetic field signal of each gear respectively; if the number of magnetic sensors is consistent with the number of gears in the gear plate assembly, each magnetic sensor includes one sensing unit group. At this time, each magnetic sensor is placed above its corresponding gear plate and senses the magnetic field signal of the corresponding gear plate respectively.

4. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 3, characterized in that: Each sensing unit group includes two or more sensing units.

5. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 3, characterized in that: The magnetic sensor is a sensor that is highly integrated with Hall, magnetoresistive and CMOS circuits; or a discrete Hall sensor or a magnetoresistive sensor based on magnetoresistive effect, which is matched with discrete electronic components for signal processing.

6. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 1, characterized in that: The gears in the gear plate assembly are soft magnetic wheel-shaped structures that rotate along the axis, including at least two coaxially placed gears side by side, and each gear has the same inner and outer diameters and materials. The difference between different gears is that the number of teeth on the gears differs by one.

7. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 1, characterized in that: The gears in the gear plate assembly are made of soft magnetic or semi-hard magnetic materials.

8. The high-precision gear plate absolute position magnetic encoder measurement system according to claim 1, characterized in that: The magnetic mechanism is made of permanent magnetic material, and when the gear plate rotates, it provides a magnetic field for the magnetic sensor in the middle together with the gear plate.

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