CN107869949B - Axial displacement detection method and device and axial displacement sensor - Google Patents
Axial displacement detection method and device and axial displacement sensor Download PDFInfo
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- CN107869949B CN107869949B CN201711020228.7A CN201711020228A CN107869949B CN 107869949 B CN107869949 B CN 107869949B CN 201711020228 A CN201711020228 A CN 201711020228A CN 107869949 B CN107869949 B CN 107869949B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses an axial displacement detection method and device and an axial displacement sensor. Wherein, the method comprises the following steps: acquiring a plurality of axial displacement signals of a detection surface through a plurality of probes in an axial displacement sensor, wherein the detection surface is a detection plane for detecting the axial displacement of a shaft of a magnetic suspension system; and determining the axial displacement of the shaft according to the collected plurality of axial displacement signals. The invention solves the technical problem of unreal and inaccurate axial displacement detection caused by the inclination of the detection surface and the inconsistency of the sensor.
Description
Technical Field
The invention relates to the field of magnetic suspension detection, in particular to an axial displacement detection method and device and an axial displacement sensor.
Background
In a magnetic levitation system, radial and axial displacements of the shaft need to be detected, and the accuracy of the detection directly determines the stability of the system operation. Fig. 1 is a schematic view of an axial displacement detection scheme according to the related art, and in general, in order to save axial space of a magnetic levitation system, as shown in fig. 1, the axial displacement detection scheme is to sleeve a detection surface on a shaft, and the axial displacement of the shaft is determined by measuring the axial movement of the detection surface. Inevitably, due to errors in machining and assembly, the detection surface and the rotating shaft cannot be completely perpendicular, a certain inclination exists, and when the rotating shaft rotates, the axial movement of the rotating shaft cannot be truly reflected through the displacement measured by the detection surface.
The solution of the related art is to symmetrically install two displacement sensors above a vertical detection surface, and the two displacement sensors have a phase difference of 180 degrees, fig. 2 is a schematic diagram of a dual-sensor axial displacement detection scheme according to the related art, and as shown in fig. 2, the influence of the inclination of the detection surface on an axial displacement signal is eliminated by averaging the two sensors. However, this solution has a disadvantage that it necessarily requires the two sensors to have a very good consistency, but since the parameters of the signal processing circuit elements of the two sensors must have a certain error, it is actually difficult to ensure the consistency of the sensors, and thus the authenticity and accuracy of the axial displacement detection cannot be ensured.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides an axial displacement detection method and device and an axial displacement sensor, which at least solve the technical problem of unreal and inaccurate axial displacement detection caused by inclination of a detection surface and inconsistency of the sensor.
According to an aspect of an embodiment of the present invention, there is provided an axial displacement detection method including: acquiring a plurality of axial displacement signals of a detection surface through a plurality of probes in an axial displacement sensor, wherein the detection surface is a detection plane for detecting the axial displacement of a shaft of a magnetic suspension system; determining an axial displacement of the shaft from the plurality of collected axial displacement signals.
Optionally, the axial displacement sensor includes: a signal conditioning circuit, wherein the plurality of probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor.
Optionally, the plurality of probes are uniformly distributed on a circumferential plane having an axial distance from the detection surface.
Optionally, the axial displacement sensor is an eddy current displacement sensor.
According to another aspect of the embodiments of the present invention, there is also provided an axial displacement detection apparatus including: the system comprises an acquisition module, a detection module and a control module, wherein the acquisition module is used for acquiring a plurality of axial displacement signals of a detection surface through a plurality of probes in an axial displacement sensor, and the detection surface is a detection plane for detecting the axial displacement of a shaft of the magnetic suspension system; a determination module for determining an axial displacement of the shaft from the acquired plurality of axial displacement signals.
Optionally, the axial displacement sensor includes: a signal conditioning circuit, wherein the plurality of probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor.
Optionally, the plurality of probes are uniformly distributed on a circumferential plane having an axial distance from the detection surface.
According to another aspect of the embodiments of the present invention, there is also provided an axial displacement sensor including: the magnetic suspension system comprises a signal conditioning circuit and a plurality of probes, wherein the probes are connected in the signal conditioning circuit, the probes are used for acquiring a plurality of axial displacement signals of a detection surface, and the detection surface is a detection plane used for detecting the axial displacement of a shaft of the magnetic suspension system.
Optionally, the multiple probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor.
According to another aspect of an embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program executes the axial displacement detection method according to any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, where the program executes the axial displacement detection method described in any one of the above.
In the embodiment of the invention, a plurality of axial displacement signals of a detection surface are acquired by a plurality of probes in an axial displacement sensor, the axial displacement of a shaft is determined according to the plurality of acquired axial displacement signals, and the aim of improving the authenticity and the accuracy of the axial displacement detection by the axial displacement sensor is fulfilled by connecting the plurality of probes for acquiring the axial displacement of the shaft of the magnetic suspension system to a signal conditioning circuit, so that the authenticity and the accuracy of the axial displacement detection are improved, the stability of the operation of the magnetic suspension system is improved, the design of the signal conditioning circuit of the displacement sensor is simplified, the technical effect of improving the reliability of a hardware circuit is achieved, and the technical problem that the axial displacement detection is not authentic and inaccurate due to the inclination of the detection surface and the inconsistency of the sensor is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an axial displacement detection scheme according to the related art;
FIG. 2 is a schematic diagram of a dual sensor axial displacement detection scheme according to the related art;
FIG. 3 is a schematic illustration of the signal output of a dual sensor axial displacement detection scheme according to the related art;
FIG. 4 is a second schematic signal output diagram of a dual sensor axial displacement detection scheme according to the related art;
FIG. 5 is a flow chart of a method of axial displacement detection according to an embodiment of the present invention;
FIG. 6 is a first schematic diagram of a dual probe axial displacement sensing scheme in accordance with an embodiment of the present invention;
FIG. 7 is a second schematic diagram of a dual probe axial displacement sensing scheme in accordance with an embodiment of the present invention;
FIG. 8 is a schematic signal output diagram of a dual probe axial displacement detection scheme in accordance with an embodiment of the present invention;
FIG. 9 is a third schematic diagram of a dual probe axial displacement sensing scheme in accordance with an embodiment of the present invention;
FIG. 10 is a front view of two probe arrangements according to embodiments of the invention;
fig. 11 is a schematic structural diagram of an axial displacement detection device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for axial displacement detection, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
Fig. 5 is a flow chart of an axial displacement detection method according to an embodiment of the present invention, as shown in fig. 5, the method including the steps of:
step S502, a plurality of axial displacement signals of a detection surface are collected through a plurality of probes in an axial displacement sensor, wherein the detection surface is a detection plane used for detecting the axial displacement of a shaft of a magnetic suspension system;
step S504, the axial displacement of the shaft is determined according to the collected multiple axial displacement signals.
Through the steps, a plurality of axial displacement signals of the detection surface can be acquired through a plurality of probes in one axial displacement sensor, the axial displacement of the shaft is determined according to the plurality of acquired axial displacement signals, the purpose of improving the authenticity and accuracy of axial displacement detection through one axial displacement sensor is achieved, the authenticity and accuracy of axial displacement detection are improved, the stability of operation of a magnetic suspension system is improved, the design of a displacement sensor signal conditioning circuit is simplified, the technical effect of the reliability of a hardware circuit is improved, and the technical problem that the axial displacement detection is not authentic and inaccurate due to the fact that the detection surface is inclined and the sensors are inconsistent is solved.
It should be noted that, in step S102, the axial displacement sensor generally comprises a probe and a signal conditioning circuit, wherein the probe is in the form of a coil. The signal conditioning circuit provides high-frequency alternating current for the probe, an alternating magnetic field is generated around the probe, induced current is generated on the surface of the detection surface, the current generates a new alternating magnetic field, the magnetic field can influence the magnetic field generated by the probe, so that the equivalent impedance of the probe coil correspondingly changes, and the change is related to the distance between the detection surface and the probe, therefore, the signal conditioning circuit obtains the displacement change of the detection surface and the probe by measuring the impedance change of the probe coil.
In general, most ideally, the sensing surface should be substantially perpendicular to the shaft, and axial displacement of the shaft can be determined by measuring the axial movement of the sensing surface with a displacement sensor, as shown in FIG. 1. However, due to processing and assembly errors, the detection surface and the rotating shaft cannot be completely perpendicular to each other, a certain inclination exists, and when the rotating shaft rotates, the axial movement of the rotating shaft cannot be truly reflected by the displacement measured by the detection surface. Therefore, the displacement sensor with the plurality of probes is arranged above the detection surface, and the influence of the inclination of the detection surface on the axial displacement signal is eliminated by comprehensively processing displacement information acquired by the plurality of probes. Where d is the distance between the detection surface and the probe.
Preferably, the axial displacement sensor includes: the system comprises a signal conditioning circuit, a plurality of probes, a signal processing circuit and a signal processing circuit, wherein the probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or a plurality of probes are simultaneously connected in parallel in a signal conditioning circuit of the axial displacement sensor.
In the related art, as shown in fig. 2, two probes are respectively arranged in two axial displacement sensors, and the influence of the inclination of the detection surface on the axial displacement signal is eliminated by averaging the two sensors. However, since the parameters of the two sensor signal processing circuit elements inevitably have certain errors, that is, the consistency of the sensors is difficult to ensure, if the axial detection surface is installed obliquely, the displacement of the fixed rotating shaft in the axial direction is not changed, and the rotating shaft is rotated once, the output signals of the sensor 1 and the sensor 2 are a sine wave, and the phase difference between the two signals is 180 degrees, wherein d1 is the distance between the detection surface and the probe 1, d2 is the distance between the detection surface and the probe 2, and S is the detected axial displacement signal. Fig. 3 is a schematic diagram showing signal outputs of a dual-sensor axial displacement detection scheme according to the related art, i.e., when the sensor 1 and the sensor 2 are identical, i.e., the amplitudes of the sinusoidal waves output by the two sensors are the same, the average value of the two signals is a fixed value, as shown in fig. 3. However, when the two sensors are not consistent, that is, the amplitudes of the sine waves output by the two sensors are different, fig. 4 is a schematic diagram of signal output of a dual-sensor axial displacement detection scheme according to the related art, as shown in fig. 4, the average value of the two sensors cannot be kept as a fixed value, but is still a sine wave, and the amplitude is related to the difference between the two sensors, so that the axial displacement fed back to the magnetic levitation control system by the sensors is changed, but the shaft does not axially move actually, thereby affecting the control action of the bearing control system on the shaft, and affecting the stability of shaft levitation.
In the embodiment of the present invention, for example, two sensor probes are arranged in the axial direction of the detection surface, for example, the two probes are uniformly arranged at 180 degrees, and the parameters of the two probes are the same, the two probes are connected in series, and only one signal conditioning circuit is needed to process the signals of the two probes, fig. 6 is a schematic diagram i of a dual-probe axial displacement detection scheme according to the embodiment of the present invention, when the detection surface is inclined as shown in fig. 6, that is, when the detection surface is close to the probe 1 and far from the probe 2, the displacement signal output by the conditioning circuit is S1. Fig. 7 is a second schematic diagram of a dual-probe axial displacement detection scheme according to an embodiment of the present invention, when the detection plane is tilted as shown in fig. 7, i.e. away from the probe 1 and close to the probe 2, the displacement signal output by the conditioning circuit is S2, and since the parameters of the two probes are identical, in both cases, the influence of the detection plane on the probes is identical, and the impedance of the probes is changed, so the output of the conditioning circuit is also identical, i.e. S1 is equal to S2. When the detecting surface rotates at other angles, the output of the conditioning circuit can be obtained similarly, and fig. 8 is a signal output schematic diagram of a dual-probe axial displacement detecting scheme according to an embodiment of the present invention, as shown in fig. 8, that is, the output signal remains unchanged after the detecting surface rotates one circle. Therefore, the influence of the inclination of the detection surface is eliminated, and meanwhile, the problem that the axial displacement is influenced by the inconsistency of the parameters of the components in the two sensor signal conditioning circuits does not exist because only one signal conditioning circuit is used.
Fig. 9 is a third schematic diagram of a dual-probe axial displacement detection scheme according to an embodiment of the present invention, it should be noted that the connection manner of the probes is not limited to series connection, but may also be parallel connection, and the effect is consistent with the series connection scheme, specifically as shown in fig. 9.
Preferably, the plurality of probes are evenly distributed on a circumferential plane at an axial distance from the detection surface.
In the embodiment of the invention, the plurality of probes have the same parameters and are uniformly arranged on the circumferential plane which has a certain axial distance with the detection surface, so that the axial displacement of the shaft determined according to the plurality of axial displacement signals acquired by the probes can be accurately and truly calculated. Fig. 10 is a front view showing two probe arrangements according to an embodiment of the present invention, and as shown in fig. 10, the probes may be provided in two as listed in the above embodiment, two probes are uniformly arranged at 180 degrees, or three probes are uniformly arranged at 120 degrees.
Preferably, the axial displacement sensor is an eddy current displacement sensor.
According to the Faraday's principle of electromagnetic induction, when a block-shaped metal conductor is placed in a changing magnetic field or moves to cut magnetic lines of force in the magnetic field, eddy-shaped induced current is generated in the conductor, and the current is called eddy current, which is called eddy current effect. While sensors made from eddy current effects are referred to as eddy current sensors.
The eddy current sensor can accurately measure the static and dynamic relative displacement change between the measured body and the end surface of the probe. In the analysis, vibration research and analysis measurement of the state of high-speed rotating machinery and reciprocating machinery, various parameters of the vibration state of a rotor can be continuously and accurately acquired for non-contact high-precision vibration and displacement signals. Such as the radial vibration, amplitude and axial position of the shaft. The eddy current sensor has the advantages of good long-term working reliability, wide measuring range, high sensitivity, high resolution and the like, and is widely applied to the online monitoring and fault diagnosis of the state of large-scale rotating machinery.
According to another aspect of the embodiment of the present invention, there is provided an axial displacement detecting device, and fig. 11 is a schematic structural diagram of the axial displacement detecting device according to the embodiment of the present invention, as shown in fig. 11, the axial displacement detecting device includes: an acquisition module 112 and a determination module 114. The following describes the axial displacement detection device in detail.
An acquisition module 112, configured to acquire a plurality of axial displacement signals of a detection surface through a plurality of probes in an axial displacement sensor, where the detection surface is a detection plane for detecting axial displacement of a shaft of a magnetic levitation system;
and a determining module 114, connected to the acquiring module 112, for determining the axial displacement of the shaft according to the acquired plurality of axial displacement signals.
According to another aspect of the embodiments of the present invention, there is provided an axial displacement sensor, which includes a signal conditioning circuit and a plurality of probes connected to the signal conditioning circuit, wherein the plurality of probes are configured to acquire a plurality of axial displacement signals of a detection surface, and the detection surface is a detection plane for detecting axial displacement of a shaft of a magnetic levitation system. Meanwhile, a plurality of probes are sequentially connected in series in a signal conditioning circuit of the axial displacement sensor; and/or a plurality of probes are simultaneously connected in parallel in a signal conditioning circuit of the axial displacement sensor.
According to another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program executes the axial displacement detection method of any one of the above.
According to yet another embodiment of the present invention, there is further provided a processor for executing a program, wherein the program executes the axial displacement detection method according to any one of the above.
The processor comprises a kernel, and the kernel calls a corresponding program unit from the memory. The kernel can be set to be one or more than one, and axial displacement detection is realized by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An axial displacement detection method, comprising:
acquiring a plurality of axial displacement signals of the same detection surface by a plurality of probes in an axial displacement sensor, wherein the detection surface is a detection plane for detecting the axial displacement of a shaft of a magnetic suspension system, the detection surface is an end surface of the shaft of the magnetic suspension system, and the plurality of probes are distributed on a circumferential plane which has a preset axial distance with the detection surface;
determining the axial displacement of the shaft according to the collected axial displacement signals, wherein the influence of the inclination of the detection surface on the determination of the axial displacement of the shaft is eliminated through the axial displacement signals;
the axial displacement sensor includes: a signal conditioning circuit for providing high-frequency alternating current for the plurality of probes, wherein the plurality of probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor.
2. The method of claim 1, wherein the plurality of probes are evenly distributed on a circumferential plane at an axial distance from the detection surface.
3. The method of any one of claims 1-2, wherein the axial displacement sensor is an eddy current displacement sensor.
4. An axial displacement detection device, comprising:
the system comprises an acquisition module, a detection module and a control module, wherein the acquisition module is used for acquiring a plurality of axial displacement signals of the same detection surface through a plurality of probes in an axial displacement sensor, the detection surface is a detection plane used for detecting the axial displacement of a shaft of a magnetic suspension system, the detection surface is an end surface of the shaft of the magnetic suspension system, and the plurality of probes are distributed on a circumferential plane which has a preset axial distance with the detection surface;
the determining module is used for determining the axial displacement of the shaft according to the plurality of acquired axial displacement signals, wherein the influence of the inclination of the detection surface on the determination of the axial displacement of the shaft is eliminated through the plurality of axial displacement signals;
characterized in that the axial displacement sensor comprises: a signal conditioning circuit for providing high-frequency alternating current for the plurality of probes, wherein the plurality of probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor.
5. The apparatus of claim 4, wherein the plurality of probes are evenly distributed on a circumferential plane at an axial distance from the detection surface.
6. An axial displacement sensor, comprising: one signal conditioning circuit and a plurality of probes connected to the one signal conditioning circuit, wherein,
the system comprises a plurality of probes, a detection plane, a plurality of sensors and a controller, wherein the plurality of probes are used for acquiring a plurality of axial displacement signals of the same detection plane, the detection plane is used for detecting the axial displacement of a shaft of a magnetic suspension system, the detection plane is an end face of the shaft of the magnetic suspension system, the plurality of probes are distributed on a circumferential plane which has a preset axial distance with the detection plane, the plurality of probes are used for acquiring a plurality of axial displacement signals, and the plurality of axial displacement signals are used for eliminating the influence of the inclination of the detection plane on the determination of the axial displacement of the shaft;
the plurality of probes are sequentially connected in series in the signal conditioning circuit of the axial displacement sensor; and/or the plurality of probes are simultaneously connected in parallel in the signal conditioning circuit of the axial displacement sensor, wherein the signal conditioning circuit is used for providing high-frequency alternating current for the plurality of probes.
7. A storage medium characterized by comprising a stored program, wherein the program executes the axial displacement detection method according to any one of claims 1 to 3.
8. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the axial displacement detection method according to any one of claims 1 to 3 when running.
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| CN109287255B (en) * | 2018-08-23 | 2021-08-03 | 江苏大学 | Axle heartbeat orbit testing arrangement |
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| CN105066857B (en) * | 2015-05-27 | 2018-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Shaft position detection device and magnetic suspension motor |
| CN105352466B (en) * | 2015-12-14 | 2018-03-20 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of device for detecting axial displacement, method and magnetic suspension bearing |
| CN205262392U (en) * | 2015-12-24 | 2016-05-25 | 珠海格力节能环保制冷技术研究中心有限公司 | Axial displacement detection device and magnetic suspension bearing system of pivot |
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