Sensor system and method for measuring a rotational parameter of a rotating shaft using the same

Abstract

The present invention relates to a sensor system for measuring a rotational parameter of a rotating shaft and a method for measuring a rotational parameter of a rotating shaft using the same, the sensor system comprising: an encoder wheel, the encoder wheel being an annular gear made of ferromagnetic material, having a periodic teeth and gaps on its outer circumference, the encoder wheel being configured to be fixed on the rotating shaft; a sensor array, the sensor array comprising at least two magnetic sensors, each magnetic sensor being arranged at an equal distance from the edge of the outer circumference of the encoder wheel along the outer circumference of the encoder wheel, the magnetic sensor being configured to detect whether a transition edge between the teeth and the gaps of the encoder wheel is passed; and a bias magnet, the bias magnet being arranged outside each magnetic sensor, one pole of the bias magnet being directed towards an inside direction and the other pole being directed towards an outside direction, the bias magnet being configured to generate a bias magnetic field.

Description

Technical Field

[0001] This disclosure generally relates to the field of low-voltage / medium-voltage switchgear technology, and more specifically, to a sensor system and a method for measuring rotational parameters of a rotating shaft using the same. Background Technology

[0002] Low-voltage / medium-voltage switchgear in power distribution system substations relies on electromechanical systems to establish and disconnect electrical connections, such as quickly disconnecting the grid in the event of a short circuit, thereby preventing damage to grid infrastructure and nearby assets.

[0003] Even under high load currents and a wide variety of load and environmental conditions, switches must be reliable and repeatable. The engagement or disengagement of the switch's electrical contacts must be quite rapid to avoid or reduce arcing between contacts during switching, and to ensure a rapid response to short-circuit conditions.

[0004] Common mechanisms for ensuring rapid engagement / disengagement of switch contacts rely on mechanical springs, tensioned by a geared motor (or even manually). When a switching event (open or close) is triggered—for example, manually or via a protective relay—the spring tension is released and mechanically translated into rapid movement of the switch contacts. Typically, the mechanism achieving this conversion involves at least one rotating shaft driven by a spring, which in turn drives (usually three) actuators that perform the actual switching movements of the various phases of the electrical line.

[0005] Normally, the rotating shaft does not rotate completely during the movement. Generally, the rotation angle is limited to about 90 degrees, or even less than 90 degrees.

[0006] Measuring and analyzing the rotational speed (or precise angle change over time) of the rotating shaft during switching operations can provide valuable insights into the health of the entire switching mechanism. More importantly, it allows for periodic verification that the switching equipment can complete the opening / closing of the circuit within the timeframes required by technology and / or law. Therefore, monitoring the rotational speed of the rotating shaft during normal operation is a crucial prerequisite for providing preventative maintenance services.

[0007] To meet the need for measuring and reporting the actual rotational characteristics of a rotating shaft, a suitable sensor is required to acquire this data.

[0008] The requirements for this type of sensor can be summarized as follows.

[0009] - Sufficiently high time resolution (a switching action must typically be completed within 300ms, i.e., time resolution in the ms range or better).

[0010] - It has strong resistance to dust, dirt, extreme temperatures, etc.

[0011] - Its small size allows the sensor to be attached to existing products as an upgrade.

[0012] Sensors that indicate the angle and / or rotation of a shaft are commonly referred to as "rotary encoders." The most common type of rotary encoder is based on optical measurement, which typically uses one or more light barriers to detect the slots in a slotted, opaque disk attached to the shaft. These encoders usually have to be mounted at the end of the shaft, making them unsuitable for retrofitting older equipment and relatively sensitive to dust.

[0013] Magnetic encoders are insensitive to most types of dirt and are quite common, for example, in servo motors. Some off-the-shelf solutions for the target use case are based on a combination of a magnet mounted on the shaft end and a fixed 2- or 3-axis magnetic encoder (e.g., based on magnetoresistive effects) mounted a short distance from the shaft end. For this type of magnetic encoder, placing the magnet at the center of the shaft can be problematic, and the two encoder assemblies must be mounted separately at or near the shaft end, aligned with the axis. This makes the solution unsuitable for retrofitting existing equipment in space-constrained situations.

[0014] Resistive and capacitive rotary encoders also exist, but they are less common and not suitable for retrofitting existing equipment.

[0015] Currently, differential Hall effect sensors can be used to measure the wheel speed of a car. However, such sensors cannot provide good angular resolution, cannot output absolute angles, and cannot reliably detect the direction of rotation. Summary of the Invention

[0016] A brief overview of the invention is given below to provide a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0017] In view of this, the present invention proposes a sensor system based on an array of multiple magnetic sensors and a bias magnet, which can accurately and reliably obtain the rotation parameters of a rotating shaft.

[0018] According to one aspect of this disclosure, a sensor system is provided for measuring rotational parameters of a rotating shaft, comprising:

[0019] The encoder wheel is a ring gear made of ferromagnetic material, with periodic teeth and gaps on its outer circumference, and is used to fix it on a rotating shaft;

[0020] A sensor array comprising at least two magnetic sensors, each magnetic sensor being arranged equidistant from the outer circumference of the encoder wheel, the magnetic sensors being used to detect whether they pass through the transition edge between the teeth and the clearance of the encoder wheel; and

[0021] A bias magnet is arranged on the outside of each magnetic sensor, with one magnetic pole facing inward and the other magnetic pole facing outward, and the bias magnet is used to generate a bias magnetic field.

[0022] By combining several low-resolution, low-cost sensors into a sensor array with a special geometry in this way, significantly higher angular resolution can be achieved.

[0023] Optionally, in one example of the above aspects, the encoder wheel includes at least one tooth or gap with a width different from the width of the other teeth or gaps as an absolute position marker.

[0024] In this way, the absolute angular position can be detected by the specific characteristics of the encoder wheel (wider teeth / wider gaps).

[0025] Alternatively, in one example of the above aspects, the angle between two adjacent magnetic sensors is equal to that between each other.

[0026] Optionally, in one example of the above aspects, the number of bias magnets is greater than or equal to the number of magnetic sensors.

[0027] In this way, the number of bias magnets can be set as needed; by adding a magnet on each side of the sensor array, the boundary effect caused by the outermost magnetic sensor encountering different magnetic field geometries can be eliminated.

[0028] Alternatively, in one example of the above aspects, the magnetic poles of two adjacent bias magnets are arranged in an alternating manner.

[0029] In this way, compared to all magnets having the same magnetic pole direction, the reliability and accuracy of the sensor system are improved.

[0030] Alternatively, in one example of the above aspects, the sensor system further includes a magnetic yoke disposed outside the bias magnet to enhance the strength of the bias magnetic field generated by the bias magnet.

[0031] Alternatively, in one example of the above aspects, the magnetic yoke is a fan-shaped ring.

[0032] In this way, the magnetic field strength can be increased.

[0033] Alternatively, in one example of the above aspects, the magnetic sensor is a differential Hall effect sensor or a differential giant magnetoresistive effect sensor.

[0034] In this way, a suitable magnetic sensor can be selected according to the needs.

[0035] Alternatively, in one example of the above aspects, the rotating shaft is a rotating shaft in a low-voltage / medium-voltage switchgear.

[0036] According to another aspect of this disclosure, a method for measuring rotational parameters of a rotating shaft is provided, wherein the rotating shaft is adapted to be mounted on a sensor system as described above, the method comprising:

[0037] The edge detection sequence output by the magnetic sensor is obtained through a sensor system;

[0038] The absolute angular position of the rotation axis is determined based on changes in the edge detection sequence; and

[0039] The rotation parameters of the rotation axis are obtained based on the absolute angular position.

[0040] The sensor array in the sensor system according to this disclosure can utilize readily available magnetic sensors, resulting in low manufacturing costs. The encoder wheel is also easy to manufacture, requiring no special tools or materials. The angle measured using this sensor achieves good angular resolution (<1 degree), and the requirements for installation accuracy are not high. This sensor system is also suitable for retrofitting existing switchgear, as the encoder wheel can be implemented using a split collar, thus allowing connection to the rotating shaft without removing it from the switchgear. Attached Figure Description

[0041] The above and other objects, features, and advantages of the present invention will be more readily understood by referring to the following description of embodiments of the invention in conjunction with the accompanying drawings. The components in the drawings are merely for illustrating the principles of the invention. In the drawings, the same or similar technical features or components will be represented by the same or similar reference numerals. In the drawings:

[0042] Figure 1 This is a schematic structural diagram of a sensor system according to an embodiment of the present invention;

[0043] Figure 2 This is a schematic structural diagram of a sensor system according to another embodiment of the present invention;

[0044] Figure 3A-3I The working principle of the magnetic sensor is shown when the rotating shaft rotates by α / 4 degrees in sequence.

[0045] Figure 4A schematic diagram of a sensor system according to another embodiment of the present disclosure is shown;

[0046] Figure 5 A schematic diagram of a sensor system according to yet another embodiment of the present invention is shown;

[0047] Figure 6 A flowchart illustrating an exemplary process for measuring rotational parameters of a rotating shaft using a sensor system according to an embodiment of the present disclosure;

[0048] Figure 7 A block diagram of a computing device for measuring rotational parameters of a rotating shaft according to an embodiment of the present disclosure is shown.

[0049] The reference numerals in the attached figures are as follows:

[0050] 10: Sensor System 102: Encoder Wheel

[0051] 104: Sensor array; 106: Bias magnet

[0052] 108: Magnetic yoke; 1022, 1023: Absolute position markers

[0053] 1041, 1042, 1043, 1044: Magnetic sensors; 1061, 1062: Additional bias magnets

[0054] 600: Method for measuring the rotational parameters of a rotating shaft; S602, S604, S606: Steps 700: Computing device; 702: Processor

[0055] 704: Memory Detailed Implementation

[0056] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. The function and arrangement of the elements discussed may be changed without departing from the scope of this disclosure. Various processes or components may be omitted, substituted, or added as needed in the various examples. For example, the described methods may be performed in a different order than described, and steps may be added, omitted, or combined. Furthermore, features described in some examples may be combined in other examples.

[0057] As used herein, the term "comprising" and its variations are open terms meaning "including but not limited to". The term "based on" means "at least partially based on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. Unless explicitly indicated by the context, the definition of a term shall remain consistent throughout the specification.

[0058] As mentioned above, in order to ensure the fast and reliable switching of low-voltage / medium-voltage switchgear in power distribution system substations, the rotating shaft is used. Monitoring the rotation parameters of the rotating shaft during normal operation is an important prerequisite for providing preventive maintenance for low-voltage / medium-voltage switchgear.

[0059] In view of this, the present invention proposes a sensor system based on an array of multiple magnetic sensors and a bias magnet, which can accurately and reliably obtain the rotation parameters of a rotating shaft.

[0060] The sensor system according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0061] Figure 1 This is a schematic structural diagram of a sensor system 10 according to an embodiment of the present invention.

[0062] like Figure 1 As shown, the sensor system 10 according to an embodiment of the present invention includes an encoder wheel 102, a sensor array 104, and a bias magnet 106.

[0063] The encoder wheel 102 is a ring gear made of ferromagnetic material, with periodic "teeth" and "gap" around the outer circumference of the encoder wheel. The encoder wheel is used to fix itself on the rotating shaft so that the encoder wheel can rotate together with the rotating shaft.

[0064] The rotating shaft can be a rotating shaft in a low-voltage / medium-voltage switchgear.

[0065] Preferably, the encoder wheel can be a split structure, that is, it includes two collar components, which can be conveniently fixed at any suitable position on the rotating shaft to be monitored by means of, for example, bolts, without removing the rotating shaft from the installation environment.

[0066] Furthermore, it is understood that the encoder wheel may also have periodic teeth and clearances on a portion of its outer circumference, for example, one of the two collar components may have periodic teeth and clearances, rather than necessarily... Figure 1As shown, there are teeth and gaps on the outer circumference at 360 degrees, which will not be described in detail here.

[0067] The minimum width of each tooth is determined by the specifications of the magnetic sensor. The width of the gap between two adjacent teeth can be the same or different.

[0068] For ease of explanation, assume that the width of the tooth is equal to the width of the gap, and... Figure 1 The central angle of the encoder wheel corresponding to the width of each tooth is denoted as α.

[0069] To derive the absolute position information of the rotating shaft from the sensor output, preferably, at least one tooth or gap in the encoder wheel has a width different from the others. This tooth or gap with the different width is used as a marker for the absolute position. Figure 1 As shown, a gap 1022, which is wider than the other gaps, is used as an absolute position marker, while... Figure 2 In the middle, there is a tooth 1023 with a width twice that of the other teeth as an absolute position marker.

[0070] The sensor array 104 includes at least two magnetic sensors, each arranged equidistant from the outer circumference of the encoder wheel. As the rotating shaft rotates, the teeth of the encoder wheel pass through the active regions of the magnetic sensors, and each magnetic sensor is used to detect whether it passes through the transition edge between the teeth and the gap (or the gap and the teeth) of the encoder wheel.

[0071] If there are more than two magnetic sensors, then the angle between any two adjacent magnetic sensors is equal. Figure 1 The denoted β is used in this context.

[0072] Preferably, the magnetic sensor can be a differential Hall effect sensor. Alternatively, a GMR (giant magnetoresistance) sensor can also be used; the specific type of magnetic sensor is not limited in the technical solution of this invention.

[0073] At least one bias magnet 106 (typically a permanent magnet) is arranged on the outer side of each magnetic sensor (i.e., radially outward along the encoder wheel). One pole of the bias magnet faces inward (i.e., radially inward along the encoder wheel), and the other pole faces outward (i.e., radially outward along the encoder wheel). The bias magnet 106 is used to generate a bias magnetic field.

[0074] According to Figure 1 In the sensor system 10 of the illustrated embodiment, the number of bias magnets is equal to the number of magnetic sensors.

[0075] Preferably, the magnetic poles of two adjacent bias magnets are arranged in an alternating manner, such as... Figure 1 As shown, the N (north) pole and S (south) pole of the bias magnet are arranged alternately.

[0076] Preferably, the central angle α of the encoder wheel corresponding to the width of each tooth and the angle β between two adjacent magnetic sensors are selected to achieve the following requirement: when the rotating shaft rotates, the magnetic sensor elements detect the transition edge sequentially at equal angular increments, that is, so that the two sensors do not detect the transition edge at the same time.

[0077]

[0078] The above requirements can be achieved when α and β satisfy the above equation. In this equation, M is a positive integer chosen as needed, N is the number of magnetic sensors, and n is a positive integer coprime to N.

[0079] exist Figure 1 In a specific example shown, M=2, n=1, N=4. Those skilled in the art can set appropriate M, n, and N as needed to obtain the corresponding α and β, as long as it is ensured that the two sensors do not detect the transition edge at the same time, which will not be described in detail here.

[0080] In the sensor system according to the invention, the magnetic sensor and the bias magnet can, for example, be disposed on a communication circuit board and mounted at a fixed (non-rotating) part of the switching device, such that during the rotation of the rotating shaft, the teeth of the encoder wheel can pass through the active region of the magnetic sensor. In this disclosure, the mounting position and manner of the magnetic sensor and the bias magnet are not described in detail.

[0081] In the technical solution according to this disclosure, multiple magnetic sensors are arranged at a specific angular spacing, enabling the magnetic sensors to sequentially detect the transition edges of tooth-gap (or gap-tooth) transitions, thereby achieving an angular resolution significantly smaller than the tooth angle. More specifically, compared to a single sensor, the nominal resolution of a sensor array consisting of N magnetic sensors is improved by N times, and the rotation direction can also be reliably detected. If an encoder wheel with ideal geometry and sensor array dimensions are used, an angular resolution far below 1 degree can be achieved.

[0082] The following will refer to Figure 3A-3I This will explain the principle of measuring the rotational parameters of a rotating shaft using a sensor system according to an embodiment of the present invention. Figure 3A-3I The sensor system shown is illustrated using an example of a sensor array comprising four magnetic sensors 1041, 1042, 1043, and 1044.

[0083] Figure 3A-3IIt shows how the position of the teeth relative to the magnetic sensor changes when the rotating shaft is rotated counterclockwise by an angle of 2α.

[0084] from Figure 3A-3I It can be seen that, with an angular increment of α / 4, a transition edge (tooth-gap or gap-tooth transition) passes through the center of magnetic sensors 1041, 1042, 1043 and 1044 in sequence.

[0085] Figure 3A When the rotation angle δ = 0, the magnetic sensor 1041 detects a transition edge.

[0086] Figure 3B It is the rotation angle At that time, the magnetic sensor 1042 detected the next transition edge.

[0087] Figure 3C It is the rotation angle At that time, the magnetic sensor 1043 detected the next transition edge.

[0088] Figure 3D It is the rotation angle At that time, the magnetic sensor 1044 detected the next transition edge.

[0089] Figure 3E It is the rotation angle At that time, the magnetic sensor 1041 detected the next transition edge.

[0090] Figure 3F It is the rotation angle At that time, the magnetic sensor 1042 detected the next transition edge.

[0091] Figure 3G It is the rotation angle At that time, the magnetic sensor 1043 detected the next transition edge.

[0092] Figure 3H It is the rotation angle At that time, the magnetic sensor 1044 detected the next transition edge.

[0093] Figure 3I It is the rotation angle At that time, the magnetic sensor 1041 detected the next transition edge.

[0094] Therefore, the rotation direction and relative angle relative to the starting position can be obtained from the sensor output.

[0095] When the encoder wheel rotates in the same direction and the absolute position mark is not within the detection range of the magnetic sensor, the combined output of the magnetic sensor will produce a periodic sequence of magnetic sensor indices corresponding to the serial number of the magnetic sensor that is detecting the transition edge, such as "123412341234123412..." or "432143214321432...", where 1, 2, 3, and 4 are the numbers of the magnetic sensors.

[0096] If the encoder wheel has an absolute position marker, this sequence pattern is broken. That is, when a wider gap (or wider teeth) passes through the magnetic sensor, the sequence of edge detection events changes, allowing the determination of the absolute angular position of the encoder wheel and the rotating shaft. Furthermore, the angular velocity can be calculated based on the angular position and the elapsed time. The exact sequence pattern depends on the specific geometry of the encoder wheel. This invention does not limit the specific algorithm for deriving the absolute angle or the specific algorithm for calculating the angular velocity based on the angle, and will not elaborate on them here.

[0097] Figure 4 A schematic diagram of a sensor system according to another embodiment of the present disclosure is shown.

[0098] In practice, the two outermost magnetic sensors in the sensor array (e.g., Figure 3A The magnetic sensors 1041 and 1044 in the array encounter magnetic fields with different geometries. Therefore, the transition edge is not detected precisely when it passes the center of the magnetic sensor, but rather earlier or later. Considering the entire sensor array, this effect can even lead to "out-of-order" edge detection; for example, the actual sequence might be "14231423142314231423..." instead of the expected "123412341234123412...", resulting in a corresponding error in the estimated rotation angle.

[0099] Figure 4 The sensor system shown according to another embodiment of this disclosure also includes an encoder wheel, a sensor array, and a bias magnet, the arrangement and operation of which are the same as those in the reference numeral. Figure 1 The sensor system described in -3 is the same, and will not be repeated here.

[0100] exist Figure 4 In the illustrated embodiment, in Figure 1 An additional bias magnet 1061 and 1062 are added to each side of the bias magnet.

[0101] In this way, all magnetic sensors operate in a magnetic field with almost identical geometry, which depends only on the angle of the encoder wheel and not on the position of the magnetic sensors in the sensor array. This largely avoids the aforementioned "out-of-order" problem.

[0102] exist Figure 4 In the embodiment shown, the number of bias magnets is two more than the number of magnetic sensors. Those skilled in the art can also set other numbers of bias magnets as needed, which will not be elaborated here.

[0103] If the distance between the magnetic sensor and the outer circumference of the encoder wheel (air gap) increases, the reliability of the measured data will decrease. However, considering manufacturing and installation tolerances, it is desirable for the sensor system to withstand a relatively large air gap (>1 mm). The maximum permissible air gap depends on both the magnetic sensor and the strength of the bias magnetic field.

[0104] therefore, Figure 5 A schematic diagram of a sensor system according to yet another embodiment of the present invention is shown.

[0105] Figure 5 The sensor system shown according to yet another embodiment of this disclosure also includes an encoder wheel, a sensor array, and a bias magnet. The arrangement and operation of these components are the same as those in the reference citation. Figure 1 The sensor system described in -3 is the same, and will not be repeated here.

[0106] exist Figure 5 In the sensor system shown, a ferromagnetic yoke 108 is placed behind the bias magnet (i.e., outward from the radial direction of the encoder wheel). The ferromagnetic yoke 108 provides a high permeability path for the magnetic flux, thereby increasing the strength of the bias magnetic field generated by the bias magnet.

[0107] Preferably, the magnetic yoke is a fan-shaped ring.

[0108] The addition of a magnetic yoke to the sensor system allows for a larger air gap.

[0109] exist Figure 5 In the sensor system shown, with Figure 4 Similarly, an additional bias magnet is added to each side of the sensor array. This can be understood, and can also be achieved using... Figure 1 The bias magnets are arranged in a similar manner, meaning the number of bias magnets is equal to the number of magnetic sensors.

[0110] Figure 6 This is a flowchart illustrating an exemplary process of a method 600 for measuring rotational parameters of a rotating shaft using a sensor system according to an embodiment of the present disclosure.

[0111] Preferably, the rotating shaft is a rotating shaft in a low-voltage / medium-voltage switchgear. This rotating shaft is suitable for mounting a sensor system according to an embodiment of the present invention as described above.

[0112] First, in step S602, an index sequence is obtained through a sensor system, the index sequence including the index of each magnetic sensor that detects the transition edge in sequence.

[0113] In step S604, the absolute angular position of the rotation axis is determined based on the changes in the index sequence.

[0114] As described above, when the absolute mark is not within the detection range of the magnetic sensor, the index sequence of the magnetic sensor that detects the transition edge is a periodic sequence. When the tooth or gap, which serves as the absolute position mark, passes through the magnetic sensor, the index sequence changes. Based on this change, the absolute angular position of the rotation axis can be determined.

[0115] In step S606, the rotation parameters of the rotation axis are obtained based on the absolute angular position.

[0116] Rotation parameters include, for example, angle and angular velocity.

[0117] The sensor array in the sensor system according to this disclosure can utilize readily available magnetic sensors, resulting in low manufacturing costs. The encoder wheel is also easy to manufacture, requiring no special tools or materials. The angle measured using this sensor achieves good angular resolution (<1 degree), and the requirements for installation accuracy are not high. This sensor system is also suitable for retrofitting existing switchgear, as the encoder wheel can be implemented using a split-type collar, thus allowing connection to the rotating shaft without removing it from the switchgear. Compared to existing solutions, it offers advantages such as the ability to retrofit existing equipment, the ability to be installed virtually anywhere on the rotating shaft, and the potential for customization to meet different installation requirements.

[0118] The technical solution according to the present invention has at least one of the following technical advantages:

[0119] By combining several low-resolution, low-cost sensors into a sensor array with a special geometry, significantly higher angular resolution can be achieved.

[0120] • The alternating arrangement of the magnetic poles of the bias magnets improves the reliability and accuracy of the sensor system compared to all magnets having the same magnetic pole orientation.

[0121] • Absolute angular position can be detected by specific features of the encoder wheel (wider teeth / wider gaps).

[0122] • The magnetic field strength can be increased by adding a magnetic yoke to the outside of the bias magnet.

[0123] • Adding a magnet to each side of the sensor array can eliminate the boundary effect caused by the outermost magnetic sensor encountering different magnetic field geometries.

[0124] Figure 7 A block diagram of a computing device 700 for measuring rotational parameters of a rotating shaft according to an embodiment of the present disclosure is shown. According to one embodiment, the computing device 700 may include at least one processor 702 that executes at least one computer-readable instruction (i.e., the elements implemented in software above) stored or encoded in a computer-readable storage medium (i.e., memory 704).

[0125] It should be understood that the computer-executable instructions stored in memory 704, when executed, cause at least one processor 702 to perform the above-described combinations of the present disclosure. Figure 6 The description includes various operations and functions.

[0126] According to one embodiment, a non-transitory machine-readable medium is provided. This non-transitory machine-readable medium may have machine-executable instructions (i.e., the elements implemented in software as described above), which, when executed by a machine, cause the machine to perform the above-described combinations of this disclosure. Figure 6 The description includes various operations and functions.

[0127] According to one embodiment, a computer program is provided, including computer-executable instructions, which, when executed, cause at least one processor to perform the above-described embodiments of the present disclosure. Figure 6 The description includes various operations and functions.

[0128] According to one embodiment, a computer program product is provided, including computer-executable instructions that, when executed, cause at least one processor to perform the above-described combinations of the present disclosure. Figure 6 The description includes various operations and functions.

[0129] Not all units in the above structural diagrams are necessary; some units can be omitted as needed. The device structures described in the above embodiments can be physical structures or logical structures. That is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0130] The foregoing description of this disclosure is provided to enable any person skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

[0131] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sensor system (10) for measuring rotational parameters of a rotating shaft, comprising: The encoder wheel (102) is a ring gear made of ferromagnetic material, with periodic teeth and gaps on its outer circumference. The encoder wheel (102) is used to fix itself on a rotating shaft. A sensor array (104) includes at least two magnetic sensors, each magnetic sensor being arranged along the outer circumference of the encoder wheel (102) at a distance equal to the edge of the outer circumference of the encoder wheel (102). The magnetic sensors are used to detect whether they pass through the transition edge between the teeth and the gap of the encoder wheel (102) and generate an index of the magnetic sensors corresponding to the serial numbers of the magnetic sensors, so that the sensor array (104) outputs an index sequence. as well as At least two bias magnets (106) are provided, with at least one of the bias magnets (106) arranged on the outer side of the encoder wheel (102) in the radial direction of each magnetic sensor. One magnetic pole of each bias magnet (106) faces the inner direction in the radial direction of the encoder wheel (102), and the other magnetic pole faces the outer direction in the radial direction of the encoder wheel (102). The bias magnets (106) are used to generate a bias magnetic field.

2. The sensor system (10) as described in claim 1, wherein, The encoder wheel (102) includes at least one tooth or gap with a width different from the width of the other teeth or gaps as an absolute position marker.

3. The sensor system (10) as described in claim 1, wherein, The angles between two adjacent magnetic sensors are equal.

4. The sensor system (10) as described in claim 1, wherein, The number of bias magnets (106) is greater than or equal to the number of magnetic sensors.

5. The sensor system (10) as claimed in claim 1, wherein, The magnetic poles of two adjacent bias magnets (106) are arranged in an alternating manner.

6. The sensor system (10) according to any one of claims 1-5 further includes a magnetic yoke (108), the magnetic yoke (108) being disposed outside the bias magnet (106) for enhancing the strength of the bias magnetic field generated by the bias magnet (106).

7. The sensor system (10) as described in claim 6, wherein, The magnetic yoke (108) is a fan-shaped ring.

8. The sensor system (10) according to any one of claims 1-5, wherein, The magnetic sensor is a differential Hall effect sensor or a differential giant magnetoresistive effect sensor.

9. The sensor system (10) according to any one of claims 1-5, wherein, The rotating shaft is a rotating shaft in a low-voltage / medium-voltage switchgear.

10. A method for measuring the rotational parameters of a rotating shaft, wherein, The rotating shaft is adapted to mount the sensor system according to any one of claims 1-9, and the method comprises: An index sequence is acquired through a sensor system, the index sequence comprising the index of each magnetic sensor that sequentially detects the transition edge; The absolute angular position of the rotation axis is determined based on the changes in the index sequence; and The rotation parameters of the rotation axis are obtained based on the absolute angular position.

11. The method of claim 10, wherein, The rotating shaft is a rotating shaft in a low-voltage / medium-voltage switchgear.

12. A computing device (700), comprising: At least one processor (702); as well as A memory (704) coupled to the at least one processor (702), the memory being used to store instructions that, when executed by the at least one processor (702), cause the processor (702) to perform the method as described in any one of claims 10 to 11.

13. A non-transitory machine-readable storage medium storing executable instructions that, when executed, cause a machine to perform the method as described in any one of claims 10 to 11.

14. A computer program product tangibly stored on a computer-readable medium and comprising computer-executable instructions that, when executed, cause at least one processor to perform the method according to any one of claims 10 to 11.

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