Harmonic physical suppression device for magnetic velocity measurement signals

Abstract

The invention discloses a harmonic physical suppression device for a magnetic speed measurement signal, which comprises a rotating part, a multi-stage signal magnetic ring and a stator signal plate, the multi-stage signal magnetic ring and the rotating part are coaxially arranged, a gap is formed between the multi-stage signal magnetic ring and the stator signal plate, the multi-stage signal magnetic ring is provided with a plurality of permanent magnet poles, and the permanent magnet poles are arranged on the stator signal plate. The stator signal board is provided with radiation wires used in cooperation with the permanent magnet poles through an etching process, the number of the radiation wires is equal to that of the permanent magnet poles, and the radiation wires are connected in series and led out through two lead terminals. A circle of radiation wires is defined as a set, multiple sets of radiation wires are arranged, lead terminals at the two ends of each radiation wire enable induced electromotive force induced in a gap to be mutually connected in series and superposed, an amplified waveform is obtained, and the signal frequency of the waveform is related to the rotating speed of a magnetic field.

Description

Technical Field

[0001] This invention relates to the field of sensors, and more specifically to a harmonic physical suppression device for magnetic velocity measurement signals. Background Technology

[0002] Using a magnetic field for velocity detection is a simple and feasible method; commonly used structures include... Figure 1 As shown: A ring-shaped, thin-film multi-pole permanent magnet (this permanent magnet has multiple even-numbered magnetic poles of equal width evenly distributed in the radial circumferential direction) is coaxially mounted and fixed on the rotating component being measured. This multi-pole permanent magnet is referred to as a "multi-pole signal magnetic ring" in this patent (the same applies below, see below). Figure 2 Because the multi-pole signal magnetic ring rotates coaxially with the mechanical component being measured, we figuratively call it a "rotor" in terms of function. A fixed signal sensing circuit board (which we figuratively call the "stator signal board" in this patent) is installed coaxially with the "multi-pole signal magnetic ring" (there is a very small air gap between the two, which we call the "air gap").

[0003] like Figure 3 As shown, on the stator signal board, a radial line with the same width as the permanent magnet pole in the single-ring and multi-pole signal magnetic ring is formed by the printed circuit etching process (each radial copper conductor line is equivalent to a single wire, which we simply call a "radial wire"). All radial wires are connected in series and finally led out through two lead terminals. When the multi-pole signal magnetic ring rotates, the magnetic field in its air gap also rotates synchronously. Each radial wire on the stator signal board runs relative to the magnetic field lines of the air gap in its physical spatial position (the magnetic field rotates, but the wires do not move, hence "relative cutting"; note that only the radial radial wires cut the magnetic field lines to generate induced electromotive force, and all concentric lines in the circumferential direction do not cut the magnetic field but only act as series connections in the circuit for all radial wires). According to the basic physical law that a conductor cutting magnetic field lines in a magnetic field will induce an induced electromotive force at both ends of the conductor, an induced electromotive force will be induced at both ends of the radial wires. The induced electromotive force generated by each radial wire is equal in magnitude and phase, and is superimposed in series. Therefore, an induced electromotive force waveform with superimposed and amplified amplitude will be obtained at the two lead terminals. The signal frequency of this waveform is related to the rotation speed of the magnetic field. Based on the number of magnetic pole pairs of the multi-pole signal magnetic ring, the rotation speed of the measured mechanical part can be calculated. The corresponding relationship is: induced electromotive force signal frequency (Hz) = number of magnetic pole pairs × measured rotation speed (rpm) / 60. Finally, this induced electromotive force waveform is sent to subsequent circuits for amplification, filtering, processing, and computation.

[0004] The above technical solution also has some drawbacks: 1. Due to various complex factors such as permanent magnet materials, magnetization process, and air gap size, the obtained "induced electromotive force" waveform contains a large number of high-order harmonics, causing the "induced electromotive force" to be distorted and deviate from the sine wave.

[0005] 2. By moving the multipole signal magnetic ring away from the stator signal plate (increasing the air gap), the harmonic content of the air gap magnetic field in the space where the radiating conductor is located can be improved to some extent (the sinusoidal nature is improved, but the magnetic field strength will be significantly reduced). However, this will bring the disadvantage of a reduction in the amplitude of the induced electromotive force waveform (the lower the signal amplitude, the higher the cost and difficulty of subsequent circuit processing, leading to an increase in the error and a decrease in the accuracy of the final result).

[0006] 3. Although electronic filters can be built using components such as resistors, capacitors, and operational amplifier ICs to filter out the high-order harmonics of the induced electromotive force, this will increase costs (high-performance operational amplifier ICs are not cheap, and the operational amplifiers built into general-purpose MCUs are generally of average performance and have insufficient processing power). In addition, the increased number of components will increase the difficulty of PCB layout, and may even lead to insufficient board area for components. The increased number of components will also increase the probability of failure and reduce system reliability.

[0007] 4. Filtering is only effective for high-order harmonics; the lower the harmonic order, the worse the filtering effect. When the waveform contains low-order harmonics such as the 3rd, 5th, and 7th, the filtering method will be ineffective and powerless, in addition to severe waveform distortion.

[0008] 5. Waveform distortion and low-order harmonics can cause waveform distortion, leading to reduced measurement accuracy and increased error. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a physical harmonic suppression device for magnetic velocity measurement signals. This device significantly reduces the harmonic content of induced electromotive force (EMF) at the physical level by making structural changes to the stator signal plate and multi-stage signal magnetic rings. It effectively suppresses harmful low-order harmonics while increasing the amplitude of the induced EMF signal, ultimately achieving improved performance and reduced costs. It is simple, economical, and highly efficient.

[0010] The technical solution of the present invention is: a harmonic physical suppression device for magnetic velocity measurement signals, comprising a rotating component, a multi-stage signal magnetic ring, and a stator signal plate. The multi-stage signal magnetic ring is coaxially arranged with the rotating component, and there is a gap between the multi-stage signal magnetic ring and the stator signal plate. The multi-stage signal magnetic ring has multiple permanent magnet poles. The stator signal plate is provided with radiating wires for use with the permanent magnet poles by an etching process. The number of radiating wires is equal to the number of permanent magnet poles. The radiating wires are connected in series and led out through two lead terminals. One loop of the radiating wire is defined as a set, and multiple sets of the radiating wire are provided. The lead terminals at both ends of the radiating wire connect and superimpose the induced electromotive force in the gap to obtain an amplified waveform. The signal frequency of the waveform is related to the rotation speed of the magnetic field.

[0011] Furthermore, the radiating conductors are provided in two sets, with radiating conductor A+ and radiating conductor A- constituting radiating conductor group A; and radiating conductor B+ and radiating conductor B- constituting radiating conductor group B. The radiating conductor group A and the radiating conductor group B are connected in series.

[0012] Furthermore, the directions of the radiating conductors A+ and B+ are defined as the incoming direction, and the directions of the radiating conductors A- and B- are defined as the outgoing direction. The radiating conductor group A and the radiating conductor group B are connected by a transverse horizontal conductor. The radiating conductors A+ and B+ are in the same direction, and the radiating conductors A- and B- are in the same direction.

[0013] Furthermore, the radiating conductors A+, B-, B+, and A- are connected in series in that order.

[0014] Furthermore, in adjacent radiating conductor groups, adjacent radiating lines under the same magnetic pole are staggered by a distance S.

[0015] Furthermore, the width between the radiating wire A+ and the radiating wire A- is L, which is the same as the width of the permanent magnet pole. The width between the radiating conductor A+ and the radiating conductor B- is greater than the width between the radiating conductor B+ and the radiating conductor A-.

[0016] Furthermore, both the radiating conductor and the magnetic pole are arranged vertically in the radial direction with an inclination angle of 0°.

[0017] Furthermore, the radiating conductor is arranged obliquely in the radial direction, and the magnetic pole is arranged vertically in the radial direction.

[0018] Furthermore, the radiating conductor is arranged vertically in the radial direction, and the magnetic pole is arranged obliquely in the radial direction.

[0019] Furthermore, the radiating conductor is arranged obliquely in the radial direction, and the magnetic pole is arranged obliquely in the radial direction.

[0020] The beneficial technical effects of this invention are: 1. The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a testing device in the prior art; Figure 2 This is a schematic diagram of a multi-stage signal magnetic ring in the prior art; Figure 3 This is a schematic diagram of a stator signal board in the prior art; Figure 4 A schematic diagram of radially temporarily opened and straightened multi-stage signal magnetic rings and stator signal boards in existing technologies; Figure 5 This is a schematic diagram of the radial temporary opening and straightening of the multi-stage signal magnetic ring and stator signal board of the present invention, Example 1; Figure 6 This is a schematic diagram of the radial temporary opening and straightening of the multi-stage signal magnetic ring and stator signal board of the present invention, Example 2; Figure 7 This is a schematic diagram of the radial temporary opening and straightening of the multi-stage signal magnetic ring and stator signal board of the present invention, Example 3; Figure 8 This invention relates to the vector star diagram method; Figure 9 This is Example 1 of the vector triangle analysis method of the present invention; Figure 10 Examples 2 and 3 of the vector triangle analysis method of the present invention. Detailed Implementation

[0022] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship described in the embodiments and shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] For a clearer description and understanding, the multi-pole signal magnetic ring and stator signal plate, rotating coaxially, are radially cut open, stretched, and unfolded. The multi-pole signal magnetic ring is displayed upwards on the upper layer, and the stator signal plate is displayed downwards on the lower layer. This clearly shows the relative positions of the radiating wires on the stator signal plate under the magnetic poles. See [link / reference]. Figure 4 , Figure 5 , Figure 6 , Figure 7 Additionally, for easier and more intuitive observation, N-level classes are displayed with shading, while S-level classes are not shaded to distinguish them.

[0026] Figure 4 In the existing technical solution, the number of magnetic poles in the multi-pole signal magnetic ring is even, with equal width and uniform distribution. The number of radiating wires is equal to the number of magnetic poles in the multi-pole signal magnetic ring and equal to the width of the magnetic poles. Both the magnetic poles and the radiating wires are radially uniformly distributed without any tilt. Since the radiating wires are periodically distributed under the magnetic poles, it is only necessary to examine and analyze a pair of adjacent magnetic poles: radiating wires A+ and A- span one magnetic pole distance in the magnetic field, so the magnetic fields at the two radiating wires are equal in magnitude and opposite in direction. Therefore, the induced electromotive forces induced by radiating wires A+ and A- are equal in magnitude and opposite in direction, with a waveform phase difference of 180°. However, because the first and second leads are connected in series in the circuit, they are actually arithmetically superimposed after being connected to the circuit. The waveform of the induced electromotive force induced by the radiating wires will be completely consistent with the waveform of the magnetic field of a single magnetic pole. Therefore, magnetic field related information can be obtained by studying the waveform of the induced electromotive force (amplitude, harmonic distortion). The purpose of this magnetic sensor is to obtain the rotational speed of the object being measured by detecting the frequency of the induced electromotive force signal waveform. It is desirable that the output waveform of the lead terminal has a large amplitude and good sinusoidal characteristics (low harmonic content, which can improve accuracy and reduce error).

[0027] This invention specifically relates to a harmonic physical suppression device for magnetic velocity measurement signals, comprising a rotating component, a multi-stage signal magnetic ring, and a stator signal plate. The multi-stage signal magnetic ring is coaxially arranged with the rotating component, and there is a gap between the multi-stage signal magnetic ring and the stator signal plate. The multi-stage signal magnetic ring has multiple permanent magnet poles. The stator signal plate is provided with radiating wires for use with the permanent magnet poles by an etching process. The number of radiating wires is equal to the number of permanent magnet poles. The radiating wires are connected in series and led out through two lead terminals. One loop of the radiating wire is defined as a set, and multiple sets of the radiating wire are provided. The lead terminals at both ends of the radiating wire connect and superimpose the induced electromotive force in the gap to obtain an amplified waveform. The signal frequency of the waveform is related to the rotation speed of the magnetic field.

[0028] The radiation conductors are provided in two sets, with radiation conductor A+ and radiation conductor A- constituting radiation conductor group A; and radiation conductor B+ and radiation conductor B- constituting radiation conductor group B. The radiating conductor group A and the radiating conductor group B are connected in series.

[0029] The directions of the radiating conductors A+ and B+ are defined as the incoming direction, and the directions of the radiating conductors A- and B- are defined as the outgoing direction. The radiating conductors A and B are connected by a horizontal conductor. The radiating conductors A+ and B+ are in the same direction, and the radiating conductors A- and B- are in the same direction.

[0030] The radiating conductors are connected in series in the following order: A+, B-, B+, and A-.

[0031] In adjacent radiating conductor groups, adjacent radiating lines under the same magnetic pole are staggered by a distance S.

[0032] The width between the radiating conductor A+ and the radiating conductor A- is L, which is the same as the width of the permanent magnet pole. The width between the radiating conductor A+ and the radiating conductor B- is greater than the width between the radiating conductor B+ and the radiating conductor A-.

[0033] Example 1: Multiple sets of radiating conductor assemblies are used instead of the single set of radiating conductor assemblies commonly found in commercial solutions. Figure 5 Two sets of radiating conductor groups are drawn: radiating conductor A+ and radiating conductor A- constitute radiating conductor group A (due to their periodic arrangement, only one pair of magnetic poles needs to be drawn and analyzed). Note that... Figure 5 Although two sets of radiating conductor groups are used as an example, in reality, the number of conductor groups can be more than two. The offset distance S between adjacent groups under the same magnetic pole is generally equal and evenly distributed.

[0034] In this scheme, the magnetic poles, radiating wire groups, etc., remain straight in the radial direction without any tilting, i.e., the tilt angle is 0°.

[0035] The radiating wire group A and the radiating wire group B are connected in series in the circuit, so the output signal amplitude of the lead terminals will be greatly enhanced.

[0036] In adjacent groups of radiating conductors, adjacent radiating lines under the same magnetic pole are offset by a distance S. Therefore, the electromotive force waveforms induced by adjacent radiating conductors (such as "radiating conductor A+" and "radiating conductor B+" in Example 5) have equal amplitude and frequency, but differ in phase by an "adjacent electrical angle α" (α = 180° × S / L). When analyzing the induced electromotive force waveform at the output, we are concerned with the relative angle of each group of radiating lines in the magnetic field (defining the width L of a magnetic pole as a 180° magnetic field angle), the phase angle of the induced electromotive force waveform, and the superposition effect under the fundamental magnetic field and higher harmonic magnetic fields (called the electrical angle, which is the manifestation of the magnetic field angle in the induced electromotive force waveform).

[0037] We expect the induced amplitude and superposition effect of the radiating conductor under the fundamental magnetic field to be as large as possible, while the superposition effect under the higher harmonic magnetic field to be as small as possible (in practice, we expect cancellation superposition, and if it cannot be completely canceled, we expect to achieve some degree of partial cancellation in order to reduce or weaken the influence of higher harmonics).

[0038] According to the principles of physics and mathematics, any periodic waveform (mathematically called a function) can be expanded into a Fourier series. That is, any periodic waveform can be composed of a fundamental frequency sine wave (fundamental wave) + a third-order sine wave (third harmonic) + a fifth-order sine wave (fifth harmonic) + ... (up to infinity). In physics, we can use "fundamental wave + third harmonic + fifth harmonic + ... (up to infinity)" to study the superposition, fitting, and decomposition of signals. The physical laws and research results are completely equivalent. We can imagine the magnetic field of the magnetic pole (air gap) as being composed of: a fundamental frequency sine wave (fundamental wave), a third-order sine wave (third harmonic), a fifth-order sine wave (fifth harmonic), and so on up to infinitely high-order harmonics. We can decompose it and study and examine the induced electromotive force waveforms induced in the relevant conductors of the radiating conductor group under the fundamental wave and each oblique wave, examining their amplitude and superposition effect.

[0039] Vector analysis method ( Figure 8 , Figure 9 Vector triangulation is an intuitive, visual, and simple tool, and can be divided into the star diagram method and the triangle method. Because the vectors in the star diagram method require parallelogram synthesis, the derivation of calculation formulas is not as convenient and intuitive as the vector triangle method, which is therefore more widely used. Mathematical analytical methods rely entirely on mathematical analysis and calculation processes, which are tedious, abstract, and generally difficult to deeply connect with and understand physical phenomena. Therefore, this patent exclusively uses the vector triangle analysis method to analyze and study the magnetic field induction phenomenon of radiating conductors.

[0040] A "stagger coefficient K1" is used to evaluate the vector superposition effect of the induced electromotive force waveforms of adjacent radiating conductors under the same magnetic pole due to the stagger effect ("radiating conductor A+" and "radiating conductor B+" in Figure 5). Figure 8 Taking three groups as an example (more than two groups) of conductor groups, the vector star diagram method is used. Figure 9 This is a vector triangle diagram of a conductor group, taking three groups as an example (more than two groups).

[0041] The "stagger coefficient K1" is defined as the sum of the amplitudes of the total composite vector and the amplitudes of the individual vectors. It reflects the "amplitude discounting effect after the total vector superposition" (because when calculating the total superposition effect, we usually compare the total superposition result with the sum of the arithmetic values ​​of all individual radiating conductors). The value of K1 ranges from 0 to 1: K1=1 represents complete superposition (all individual vectors are completely coincident, have the same direction, and the adjacent electrical angle α is 0°, the superposition effect is the maximum and is the arithmetic sum of all individual vectors), K1=0 represents complete cancellation, and the vector composite result is 0 (the adjacent electrical angle α is 180°, at which point the superposition effect is zero, that is, the two vectors cancel each other out after addition, resulting in zero).

[0042] To derive a more general calculation formula, we take... Figure 9 Taking the vector triangle diagram method as an example: a. "Adjacent electrical angle α" = 180° × Distance between adjacent radiation lines S / L ---------- Formula 1 b. The vectors of individual radiation lines are E1, E2, ..., Eq; where q is the number of conductor groups; the total composite vector is Er. c. The offset coefficient K1 = Er vector length / (E1 + E2 + ... + Eq, the algebraic sum of q vector lengths); from Figure 9 Draw a perpendicular line from the center of the circle to Er. It is obvious that Er = 2 × radius of the circle × Sin(qα / 2). from Figure 9 Draw a perpendicular line from the center of the circle to E1. It is obvious that E1 = 2 × radius of the circle × Sin(α / 2). Assume that E1 = E2 = Eq. Substituting into the definition of K1, we can obtain K1= Sin(qα / 2) / {q×Sin(α / 2)}-------------------------------Formula 2 Formulas 1 and 2 are the formulas for calculating the fundamental frequency. For the nth harmonic, "α" is replaced by "nα", that is: K 1n = Sin(qnα / 2) / {q×Sin(nα / 2)}-------------------------Formula 3 Example 2: like Figure 6 , Figure 10 The principle and key point are to twist the radiating conductor radially at an angle and examine how the induced electromotive force of the fundamental wave and each harmonic induced by the tilted radiating conductor under the magnetic pole (air gap magnetic field) will change. Here, a "tilt coefficient K2" is introduced to evaluate its effect (the coefficient K2 is to examine the effect of the induced electromotive force waveform caused by the tilting of the radiating conductor at a specific electrical angle).

[0043] Similarly, we need to first convert the radial tilt of the radiating conductor into an electrical angle relative to the magnetic field for evaluation and analysis; using the mathematical idea of ​​differentiation, we divide the single tilted radiating conductor into many differential segments along the radial direction, examine the induced vector of each differential segment, and then perform vector superposition on the induced vectors of all differential segments. Figure 9 As the number of segments increases, the result will gradually tend towards Figure 10 : a. Total tilt angle θ sk =180° × Inclination S / L ----------------------Formula 4 b. The combined oblique-torsional vector Er = 2 × circle radius × Sin(θ) sk / 2); Differential vector integral sum = arc length = 2 × radius of circle × θ sk ; Note that θ here sk Substitute with radians; According to the definition of K2 (K2 = the sum of the oblique-torsional composite vector Er / ∑ the sum of the differential vectors), we can obtain: c, K2 = {Sin(θ) sk / 2)} / {θ sk / 2}-----------------------------Formula 5 Formulas 4 and 5 are the formulas for calculating the fundamental frequency. For the nth harmonic, then "θ" is used. sk "Use "nθ sk "to replace, that is: K 2n = {Sin(nθ sk / 2)} / { nθ sk / 2}-----------------------------Formula 6 The skew twist coefficient K2 is equivalent to the skew twist θ of the radial conductor. sk "Discounting effect on the amplitude of induced electromotive force after electrical angle." K2 ranges from 0 to 1: K2=1 represents the tilt angle θ. skElectrical angle = 0° (at this point, the induced electromotive force of each differential line segment is equal in magnitude, phase, and superimposed, i.e., the same as the straight line segment without twist); when θ sk When the electrical angle is 360°, K2 = 0. At this time, half of the radiating conductor is tilted under the N pole and the other half is tilted under the S pole. The total vector result is 0 (the vectors of the two tilted segments are equal in magnitude and opposite in direction, so the vector result cancels each other out and the result is zero).

[0044] Example 3: like Figure 7 , Figure 10 The principle is similar to that of Example 2, except that the radial direction of the radiating conductor is kept vertical while the magnetic poles are twisted at an angle. The relative relationship between the radiating conductor and the magnetic poles remains essentially unchanged, the calculation formulas (Formulas 4-6) remain unchanged, and the calculation results and conclusions remain unchanged.

[0045] Example 4: The principle is to divide a single radiating wire or a single magnetic pole into q segments along the radial direction, with adjacent segments radially offset by S. The vector angle between adjacent segments is α. The superposition effect of the composite vector and the calculation formula are exactly the same as those in Example 1, so they will not be described in detail here.

[0046] Example 5: When Examples 1 and 2 are used in combination, the overall combined effect is K. 1n K 2n The product effect: Total composite coefficient = K 1n ×K 2n ----------------------------------------Formula 7 Although the mathematical formula is concise, it cannot intuitively provide the electrical angle and K under different harmonics for different "number of segments / groups" and different "tilts". 1n K 2n The coefficient values ​​are listed in the table below: Segmentation / Staggering coefficient table K 1n (Number of segments q=2) Segmentation / Staggering coefficient table K 1n (Number of segments q=3) Segmentation / Staggering coefficient table K 1n (Number of segments q=4) Segmentation / Staggering coefficient table K 1n (Number of segments q=5) Twist coefficient K 2n In summary, by rationally staggering the radially arranged printed radial leads on the stator signal board, or by tilting the printed radial leads along the radial direction (or by tilting the magnetic poles of the multi-pole signal magnetic ring without tilting the printed radial leads), the harmonic content of the induced electromotive force (EMF) can be significantly reduced at the physical level. This effectively suppresses harmful low-order harmonics while increasing the amplitude of the induced EMF signal, ultimately achieving improved performance and reduced costs. The results are simple, economical, and highly efficient. The output signal waveform can be directly processed by the MCU's built-in general-purpose operational amplifier without the need for additional resistors, capacitors, or high-precision operational amplifier ICs for filtering. The peripheral circuitry is simple and low-cost.

[0047] The above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and are not intended to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A harmonic physical suppression device for magnetic velocity measurement signals, comprising a rotating component, a multi-stage signal magnetic ring, and a stator signal plate, wherein the multi-stage signal magnetic ring is coaxially arranged with the rotating component, and a gap exists between the multi-stage signal magnetic ring and the stator signal plate, characterized in that, The multi-level signal magnetic ring has multiple permanent magnet poles. The stator signal board is provided with radiating wires that cooperate with the permanent magnet poles through an etching process. The number of radiating wires is equal to the number of permanent magnet poles. The radiating wires are connected in series and led out through two lead terminals. One loop of the radiating wire is defined as a set, and multiple sets of the radiating wire are provided. The lead terminals at both ends of the radiating wire connect and superimpose the induced electromotive force in the gap to obtain an amplified waveform. The signal frequency of the waveform is related to the rotation speed of the magnetic field.

2. The harmonic physical suppression device for magnetic velocity measurement signals according to claim 1, characterized in that, The radiating conductors are provided in two sets, and radiating conductor A+ and radiating conductor A- are defined as radiating conductor group A; Radiating conductor B+ and radiating conductor B- constitute radiating conductor group B; The radiating conductor group A and the radiating conductor group B are connected in series.

3. The harmonic physical suppression device for magnetic velocity measurement signals according to claim 2, characterized in that, The directions of the radiating conductors A+ and B+ are defined as the incoming direction, and the directions of the radiating conductors A- and B- are defined as the outgoing direction. The radiating conductors A and B are connected by a horizontal conductor. The radiating conductors A+ and B+ are in the same direction, and the radiating conductors A- and B- are in the same direction.

4. The harmonic physical suppression device for magnetic velocity measurement signals according to claim 3, characterized in that, The radiating conductors are connected in series in the following order: A+, B-, B+, and A-.

5. The harmonic physical suppression device for magnetic velocity measurement signals according to claim 4, characterized in that, In adjacent radiating conductor groups, adjacent radiating lines under the same magnetic pole are staggered by a distance S.

6. The harmonic physical suppression device for magnetic velocity measurement signals according to claim 5, characterized in that, The width between the radiating conductor A+ and the radiating conductor A- is L, which is the same as the width of the permanent magnet pole. The width between the radiating conductor A+ and the radiating conductor B- is greater than the width between the radiating conductor B+ and the radiating conductor A-.

7. The harmonic physical suppression device for magnetic velocity measurement signals according to any one of claims 1-6, characterized in that, Both the radiating conductor and the magnetic pole are arranged vertically along the radial direction with an inclination angle of 0°.

8. The harmonic physical suppression device for magnetic velocity measurement signals according to any one of claims 1-6, characterized in that, The radiating conductor is arranged obliquely in the radial direction, and the magnetic pole is arranged vertically in the radial direction.

9. The harmonic physical suppression device for magnetic velocity measurement signals according to any one of claims 1-6, characterized in that, The radiating conductor is arranged vertically in the radial direction, and the magnetic pole is arranged obliquely in the radial direction.

10. The harmonic physical suppression device for magnetic velocity measurement signals according to any one of claims 1-6, characterized in that, The radiating conductor is arranged obliquely in the radial direction, and the magnetic pole is arranged obliquely in the radial direction.

Images