CN110608661B - Sensor detection circuit and method and magnetic suspension bearing system - Google Patents
Sensor detection circuit and method and magnetic suspension bearing system Download PDFInfo
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- G—PHYSICS
- 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 a sensor detection circuit and method and a magnetic suspension bearing system. Wherein, this detection circuitry includes: a relay switch; the single armed bridge is connected with the relay switch, wherein, the single armed bridge includes at least: a first sensor probe coil and a second sensor probe coil; the voltage acquisition unit is used for acquiring a voltage output value after the detection instruction is received and the relay switch is closed; the control unit is used for determining that the working states of the first sensor probe coil and the second sensor probe coil are normal if the voltage output value is within a preset voltage range, and determining that the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal; and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information.
Description
Technical Field
The invention relates to the technical field of sensor detection, in particular to a sensor detection circuit and method and a magnetic suspension bearing system.
Background
In the related art, for a magnetic suspension bearing system, if stable operation of a bearing is to be achieved, an eddy current sensor is required to detect the position of the bearing in real time, so as to prevent the bearing from deviating or bending to cause operation failure. The eddy current sensor can normally stabilize work and is the prerequisite of guaranteeing that magnetic suspension system stably suspends, and current eddy current sensor accomplishes a series of tests back in process of production, can the direct mount in the compressor, can't judge automatically whether the work of sensor is normal in the use in later stage, can't judge promptly whether the sensor breaks down, in case magnetic suspension bearing system goes wrong, need artificially measure through using detecting instrument, get rid of the possibility of eddy current sensor trouble. If the eddy current sensor fails, the data output by the sensor is abnormal data or no output, and the compressor may be damaged when the compressor is started up and runs, which may cause the problem that the magnetic suspension bearing fails to float or the shaft is touched.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a sensor detection circuit and method and a magnetic suspension bearing system, which at least solve the technical problem that whether a sensor fails to detect or not and the magnetic suspension bearing is easy to cause floating failure or shaft collision in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a sensor detection circuit including: a relay switch; a single arm bridge connected to the relay switch, wherein the single arm bridge at least includes: the sensor comprises a first sensor probe coil, a second sensor probe coil, a first resistor and a second resistor, wherein the first sensor probe coil and the second sensor probe coil are installed in a differential mode; the voltage acquisition unit is used for acquiring a voltage output value after the detection instruction is received and the relay switch is closed; the control unit is used for determining that the working states of the first sensor probe coil and the second sensor probe coil are normal if the voltage output value is within a preset voltage range, and determining that the working states of two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal and the states of target sensors to which the two sensor probes belong are normal; and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault.
Optionally, after the detection instruction is received and before the relay switch is closed, an excitation signal is input, and if the voltage output value is acquired as a target value, it is determined that both of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are in fault, and it is determined that the target sensor is in fault.
Optionally, the detection circuit further comprises: and the direct current power supply is directly connected with the relay switch, stops inputting the excitation signal when controlling the relay switch to be closed, and outputs direct current electric energy.
Optionally, the excitation signal is a high-frequency alternating excitation signal, and the high-frequency alternating excitation signal is a signal output when an excitation source of the target sensor is a high-frequency alternating current.
Optionally, the voltage acquisition unit includes: the operational amplifier is respectively connected with the probe coil of the first sensor and the probe coil of the second sensor and is used for amplifying the voltage analog signal of the acquisition probe coil and outputting the amplified voltage analog signal to the preset analog-to-digital conversion module; the preset analog-to-digital conversion module is connected with the operational amplifier and used for converting the amplified voltage analog signal into a digital signal to obtain the voltage output value.
Optionally, the preset voltage range is determined based on a voltage threshold of a first point location and a voltage threshold of a second point location, where the first point location is a connection point of the first sensor probe coil and a first access point of the operational amplifier, and the second point location is a connection point of the second sensor probe coil and a second access point of the operational amplifier.
Optionally, after it is determined that the target sensor is in a normal state, the control unit turns on a preset control switch and inputs an excitation signal to the target sensor.
Optionally, the target sensor is an eddy current sensor that detects a displacement parameter of each bearing in the target bearing system through a differential circuit.
According to another aspect of the embodiments of the present invention, there is also provided a sensor detection method applied to the sensor detection circuit described in any one of the above, the detection method including: after receiving the detection signal, controlling a relay switch to be closed, and collecting a voltage output value; if the voltage output value is within a preset voltage range, determining that the probe coils of the first sensor and the second sensor are in normal working states, and determining that the working states of the two sensor probes corresponding to the probe coils of the first sensor and the second sensor are in normal working states and the target sensor states of the two sensor probes are in normal working states; and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault.
According to another aspect of the embodiments of the present invention, there is also provided a magnetic suspension bearing system, including the sensor detection circuit described in any one of the above.
In the embodiment of the invention, a single-arm bridge circuit is realized on the basis of an eddy current sensor differential circuit, a voltage acquisition unit is used for detecting parameters, a control unit is used for judging whether a sensor fails or not, if the sensor fails, the sensor fault information is automatically output, the sensor can be automatically detected, workers can be informed that the sensor fails in time, the detection efficiency and the maintenance efficiency are improved, the normal work of the sensor can be ensured, the eddy current sensor can carry out position detection and safety monitoring on a magnetic suspension bearing and the like in real time, the occurrence probability of bearing floating failure or shaft collision is reduced, and the technical problem that whether the magnetic suspension bearing fails or shaft collision is easily caused by the fact that the sensor cannot be detected in the related technology 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 alternative electrical eddy current sensor detection circuit for detecting bearing position in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative sensor auto-detection circuit according to an embodiment of the present invention;
FIG. 3 is a flow chart of an alternative sensor detection method according to an embodiment of the present invention;
FIG. 4 is a flow chart of an alternative sensor detection method 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.
To facilitate understanding of the invention by those skilled in the art, some terms or nouns referred to in the embodiments of the invention are explained below:
the eddy current sensor generates an alternating magnetic field by introducing high-frequency alternating current to the coil, forms eddy current on the surface of a detected conductor to generate a reverse alternating magnetic field, and the impedance of the detection coil is changed by the interaction of the coil magnetic field and the eddy current magnetic field, so that the output of the coil is changed to realize measurement.
The embodiments of the present invention described below can be applied to various environments using eddy current sensors, such as magnetic suspension bearing systems using eddy current sensors to detect the position of a bearing. The operating state of the eddy current sensor is detected, so that the eddy current sensor can be kept in a normal working state, the position of the bearing is detected in real time by the eddy current sensor, and the stable operation of the bearing is ensured.
The embodiment of the invention can realize automatic detection of the running state of the eddy current sensor, does not need manual operation, and solves the problem that the compressor is possibly damaged when the sensor is started to run under the condition of failure or abnormity by automatically judging whether the sensor works normally, and simultaneously solves the problem that the fault detection needs to be carried out manually after maintenance.
Example one
The target sensor related in the embodiment of the invention can be an eddy current sensor, and the eddy current sensor detects the displacement parameter of each bearing in the target bearing system through a differential circuit to detect the running state of the eddy current sensor so as to ensure that the eddy current sensor can work normally.
According to an aspect of an embodiment of the present invention, there is provided a sensor detection circuit, the sensor detection may include:
a relay switch;
the single armed bridge is connected with the relay switch, wherein, the single armed bridge includes at least: the sensor comprises a first sensor probe coil, a second sensor probe coil, a first resistor and a second resistor, wherein the first sensor probe coil and the second sensor probe coil are installed in a differential mode;
the voltage acquisition unit is used for acquiring a voltage output value after the detection instruction is received and the relay switch is closed;
the control unit is used for determining that the working states of the first sensor probe coil and the second sensor probe coil are normal if the voltage output value is within a preset voltage range, and determining that the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal and the states of target sensors to which the two sensor probes belong are normal; and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault.
The sensor detection circuit can realize a single-arm bridge circuit on the basis of an eddy current sensor differential circuit, and utilizes a voltage acquisition unit to realize parameter detection, and utilizes a control unit to judge whether a sensor fails, if the sensor fails, sensor fault information is automatically output, automatic detection can be realized for the sensor, and workers can be informed that the sensor fails in time, so that the detection efficiency and the maintenance efficiency are improved, the normal work of the sensor can be ensured, the eddy current sensor can carry out position detection and safety monitoring on a magnetic suspension bearing and the like in real time, the occurrence probability of the floating failure or shaft collision condition of the magnetic suspension bearing is reduced, and the technical problem that whether the sensor fails to detect in the related technology and the floating failure or shaft collision of the magnetic suspension bearing is easily caused is solved.
The eddy current sensor can automatically detect the quality of the eddy current sensor, automatically judge whether the sensor normally works or not, simultaneously realize different working characteristics of the probes through different excitation sources, realize mutual detection between the two eddy current sensor probes and improve the detection efficiency.
Optionally, the detection circuit further includes: and the direct current power supply is directly connected with the relay switch, stops inputting the excitation signal when the relay switch is controlled to be closed, and outputs direct current electric energy. In the embodiment of the present invention, the excitation signal is a high-frequency alternating excitation signal, and the high-frequency alternating excitation signal is a signal output when the excitation source of the target sensor is a high-frequency alternating current.
As an alternative embodiment of the present invention, the voltage acquisition unit includes: the operational amplifier is respectively connected with the probe coil of the first sensor and the probe coil of the second sensor and is used for amplifying the voltage analog signal of the acquisition probe coil and outputting the amplified voltage analog signal to the preset analog-to-digital conversion module; and the preset analog-to-digital conversion module is connected with the operational amplifier and is used for converting the amplified voltage analog signal into a digital signal to obtain a voltage output value.
FIG. 1 is a schematic diagram of an alternative electrical eddy current sensor detection circuit for detecting bearing position, as shown in FIG. 1, the detection circuit comprising: the device comprises a bearing to be detected (shown by a shaft in figure 1), two sensor probes connected up and down on the bearing, a probe coil wound on the probes, a coil detection circuit, a differential circuit and a control unit MCU. The detection circuit is applied to a magnetic suspension bearing detection system, a bearing position signal is detected through a displacement sensing module (such as a position sensor), a displacement signal is output to a differential circuit, and a uniform detection signal is transmitted to an MCU (microprogrammed control Unit) through the differential circuit so as to analyze whether the magnetic suspension bearing is deviated or abnormal. In fig. 1 an eddy current sensor is arranged near the probe.
In fig. 1, a coil detection circuit is added, which can be understood as a sensor detection circuit, and is an automatic detection circuit that can detect whether the eddy current sensor has a fault, as shown in fig. 1, and the coil detection circuit does not affect the normal operation of the displacement sensing module or the eddy current displacement sensor.
FIG. 2 is a schematic diagram of an alternative sensor auto-detection circuit according to an embodiment of the present invention, as shown in FIG. 2, the detection circuit comprising: direct current power supply (VCC), relay switch (K1), operational amplifier, analog-to-digital conversion module (ADC) and control unit (MCU), differential probe coil (including two probe coils, namely probe coil 1 and probe coil 2) and resistor R1、R2The formed single-arm bridge has a simple structure, and can be realized by adding a switch (K1) on the basis of the existing detection circuit.
The embodiment of the invention utilizes different sensing characteristics of the probe coil of the sensor under different inputs to realize automatic detection of the sensor. The sensing characteristics comprise inductance characteristics and resistance characteristics, namely when an excitation source of the sensor is high-frequency alternating current, a probe coil of the sensor shows inductance characteristics and is connected with a capacitor in parallel to work in a resonance state; in the automatic detection circuit of the sensor, the input of a high-frequency excitation signal is cut off, and when only a direct current source (VCC) is applied to a probe coil of the sensor, the probe coil shows resistance characteristics.
The operation mode of the detection circuit comprises the following steps: when the probe coil of the eddy current sensor is designed and manufactured, the parameters of the coil can be directly determinedAnd the resistance values R of the resistors R1 and R2 in the above-mentioned detection circuit are also determined so that the resistance R is determined1、R2And two differentially mounted sensor probes (which may be defined as R, respectively)L1、RL2) Form an electrical bridge when R1/R2＝RL1/RL2The bridge is balanced, the potentials between the points a and b in fig. 2 are equal, and the operational amplifier output is 0. When one sensor probe fails, i.e. RL1Or RL2And when the output of the operational amplifier is changed, the output voltage is also changed, the data output by the operational amplifier is processed by the ADC and then is sent to the MCU, and the MCU judges whether the eddy current sensor fails or not based on the voltage output data. The detection circuit utilizes the differential circuit to realize the detection of two sensor probes at one time, and meanwhile, in the embodiment of the invention, the mutual sensing characteristic between the two sensor probes can be utilized to mutually detect whether the other side has a fault.
The specific judgment logic comprises: and judging that both the two sensor probes have faults, only one sensor probe has faults and both the two sensor probes are normal. For judging that two sensor probes both have faults, the judging mode comprises the following steps: after the detection instruction is received and before the relay switch is closed, an excitation signal is input, if the acquired voltage output value is a target value (for example, the target value is 0), it is determined that both the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are in failure, and it is determined that the target sensor is in failure. For judging that only one sensor probe has a fault, the judging method comprises the following steps: and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault. For judging that the two sensor probes are normal, the judging mode comprises the following steps: and if the voltage output value is within the preset voltage range, determining that the working states of the first sensor probe coil and the second sensor probe coil are normal, and determining that the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal and the states of target sensors to which the two sensor probes belong are normal.
Fig. 3 is a flow chart of an alternative sensor detection method according to an embodiment of the present invention, as shown in fig. 3, the detection method includes:
step S301, a controller receives a sensor detection instruction;
step S302, the controller controls to stop sending the excitation signal and controls the relay switch to be closed;
step S303, the controller receives the sampling signal and determines a voltage output value;
step S304, if the voltage output value is within the preset voltage range, controlling to turn on a control switch, applying a normal excitation signal to the eddy current sensor, and ending the detection process; the preset voltage range is determined based on a voltage threshold of a first point location and a voltage threshold of a second point location, wherein the first point location is a connection point location of a first sensor probe coil and a first access point of the operational amplifier, and the second point location is a connection point location of a second sensor probe coil and a second access point of the operational amplifier.
In step S305, if the voltage output value is not within the preset voltage range, the sensor fault information is output.
In the specific detection, when the controller (MCU) receives a power-on command or a sensor detection command, it may first determine whether two sensor probes fail simultaneously (using an excitation signal, if the differential circuit output of the sensor is 0, it is determined that the two sensors fail simultaneously), then the controller controls the relay switch (e.g. K1 in fig. 2) to close and simultaneously open the high-frequency alternating excitation signal, and the controller receives a sampling signal (which may be defined as U) and receives a sampling signalVDC) When the sensor coil is normal, the range of the sampling voltage is a<UVDC<b (the voltage range of a and b is the preset voltage range), the controller judges whether the voltage output value is in a<UVDC<b, if the eddy current sensor is normal, the controller controls to turn on the control switch, applies a normal excitation signal to the eddy current sensor, ends the detection process, otherwise, determines that the sensor is abnormal, and outputs the sensorAnd (4) fault information.
Through the embodiment, the automatic detection circuit can be added on the basis of the eddy current sensor differential circuit, different working characteristics of the sensor probes can be realized by the automatic detection circuit through different excitation sources, mutual detection between the two eddy current sensor probes is realized by detecting the two sensor probes near the bearing, whether the sensor probes break down or not is determined, and further whether the eddy current sensor breaks down or not is determined. Therefore, the automatic detection of the sensor can be realized, the problem that the compressor is damaged due to the starting under the abnormal condition of the sensor can be solved, the reliability of the magnetic suspension bearing system is improved, and the later maintenance is facilitated.
Example two
In accordance with an embodiment of the present invention, there is provided a sensor detection method embodiment, 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 here.
Fig. 4 is a flow chart of another alternative sensor detection method according to an embodiment of the present invention, which is applied to the sensor detection circuit in any one of the above-mentioned embodiments, as shown in fig. 4, the detection method includes:
step S402, after receiving the detection signal, controlling a relay switch to be closed, and collecting a voltage output value;
the detection signal may be a sensor detection signal or a power-on signal.
Step S404, if the voltage output value is within a preset voltage range, determining that the working states of the first sensor probe coil and the second sensor probe coil are normal, and determining that the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal and the states of target sensors to which the two sensor probes belong are normal;
step S406, if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault.
Through the steps, after the detection signal is received, the relay switch is controlled to be closed, the voltage output value is collected, if the voltage output value is within the preset voltage range, the working states of the first sensor probe coil and the second sensor probe coil are determined to be normal, the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are determined to be normal, the target sensor states of the two sensor probes are determined to be normal, and if the voltage output value is not within the preset voltage range, the first sensor probe or the second sensor probe is determined to be in fault, and the sensor fault information is output. In this embodiment, can realize automated inspection to the sensor to can in time inform staff's sensor to break down, improve detection efficiency and maintenance efficiency, can guarantee that the sensor normally works, can let eddy current sensor carry out position detection and safety monitoring to the bearing of magnetic suspension etc. in real time like this, reduce the magnetic suspension bearing and rise to float the emergence of failing or taking place to bump the axle condition, thereby solve unable detection sensor among the correlation technique and whether break down, cause the magnetic suspension bearing easily and rise to float the technical problem that fails or bump the axle.
According to another aspect of the embodiments of the present invention, there is also provided a magnetic bearing system including the sensor detection circuit of any one of the above.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: after the detection signal is received, the relay switch is controlled to be closed, a voltage output value is acquired, if the voltage output value is within a preset voltage range, the working states of the first sensor probe coil and the second sensor probe coil are determined to be normal, the working states of the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are determined to be normal, the target sensor states of the two sensor probes are determined to be normal, and if the voltage output value is not within the preset voltage range, the first sensor probe or the second sensor probe is determined to be in fault, and sensor fault information is output.
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 (9)
1. A sensor detection circuit for use in a magnetic bearing system that uses an eddy current sensor to detect bearing position, comprising:
a relay switch;
a single arm bridge connected to the relay switch, wherein the single arm bridge at least includes: the probe coil of the first sensor is connected with the probe coil of the second sensor in parallel and then connected with the first resistor in series, and the probe coil of the second sensor is connected with the capacitor in parallel and then connected with the second resistor in series;
the voltage acquisition unit is used for acquiring a voltage output value after the detection instruction is received and the relay switch is closed;
the control unit is used for determining that the working states of the first sensor probe coil and the second sensor probe coil are normal if the voltage output value is within a preset voltage range, and determining that the working states of two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are normal and the states of target sensors to which the two sensor probes belong are normal; if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault,
after the detection instruction is received and before the relay switch is closed, an excitation signal is input, if the voltage output value is acquired to be a target value, it is determined that the two sensor probes corresponding to the first sensor probe coil and the second sensor probe coil are in fault, and it is determined that the target sensor is in fault.
2. The detection circuit of claim 1, further comprising:
and the direct current power supply is directly connected with the relay switch, stops inputting the excitation signal when controlling the relay switch to be closed, and outputs direct current electric energy.
3. The detection circuit according to claim 2, wherein the excitation signal is a high-frequency alternating excitation signal that is a signal output when an excitation source of the target sensor is a high-frequency alternating current.
4. The detection circuit of claim 1, wherein the voltage acquisition unit comprises:
the operational amplifier is respectively connected with the probe coil of the first sensor and the probe coil of the second sensor and is used for amplifying the voltage analog signal of the acquisition probe coil and outputting the amplified voltage analog signal to the preset analog-to-digital conversion module;
the preset analog-to-digital conversion module is connected with the operational amplifier and used for converting the amplified voltage analog signal into a digital signal to obtain the voltage output value.
5. The detection circuit of claim 4, wherein the predetermined voltage range is determined based on a voltage threshold of a first point location and a voltage threshold of a second point location, wherein the first point location is a connection point of the first sensor probe coil and a first access point of the operational amplifier, and the second point location is a connection point of the second sensor probe coil and a second access point of the operational amplifier.
6. The detection circuit according to claim 1, wherein the control unit opens a preset control switch and inputs an excitation signal to the target sensor after it is determined that the target sensor is in a normal state.
7. The sensing circuit of any one of claims 1 to 6, wherein the target sensor is an eddy current sensor that senses a displacement parameter of each bearing in the target bearing system via a differential circuit.
8. A sensor detection method applied to the sensor detection circuit according to any one of claims 1 to 7, the detection method comprising:
after receiving the detection signal, controlling a relay switch to be closed, and collecting a voltage output value;
if the voltage output value is within a preset voltage range, determining that the probe coils of the first sensor and the second sensor are in normal working states, and determining that the working states of the two sensor probes corresponding to the probe coils of the first sensor and the second sensor are in normal working states and the target sensor states of the two sensor probes are in normal working states;
and if the voltage output value is not within the preset voltage range, determining that the first sensor probe or the second sensor probe has a fault, and outputting sensor fault information, wherein the sensor fault information is used for indicating that the target sensor has a fault.
9. A magnetic bearing system comprising a sensor detection circuit according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910888001.7A CN110608661B (en) | 2019-09-19 | 2019-09-19 | Sensor detection circuit and method and magnetic suspension bearing system |
Applications Claiming Priority (1)
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| CN110566582B (en) * | 2019-09-24 | 2023-11-14 | 珠海格力电器股份有限公司 | Magnetic bearing control method, magnetic bearing and magnetic bearing system |
| CN111220674A (en) * | 2020-01-16 | 2020-06-02 | 上海博取环境技术有限公司 | PH sensor fault monitoring device and monitoring method thereof |
| CN112229315A (en) * | 2020-09-22 | 2021-01-15 | 南京磁之汇电机有限公司 | Displacement sensor, method for acquiring displacement signal and computer readable storage medium |
| CN112196897B (en) * | 2020-10-10 | 2021-07-20 | 珠海格力电器股份有限公司 | Magnetic suspension bearing control system, method, device, equipment and storage medium |
| CN112729186B (en) * | 2020-12-21 | 2022-08-02 | 珠海格力电器股份有限公司 | Fault processing method, device and system for displacement sensor and processor |
| CN112729099B (en) * | 2020-12-26 | 2022-05-17 | 北京磁浮交通发展有限公司 | Gap probe detection method and device, electronic equipment and computer storage medium |
| CN112798180A (en) * | 2021-01-04 | 2021-05-14 | 珠海格力电器股份有限公司 | Fault detection method of force sensor and computer-readable storage medium |
| CN115615304B (en) * | 2022-12-20 | 2023-06-02 | 苏州苏磁智能科技有限公司 | Magnetic suspension motor, position detection sensor and sensor detection circuit |
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| JP3563705B2 (en) * | 2000-05-08 | 2004-09-08 | 学校法人東京電機大学 | Sensorless magnetic levitation device |
| CN100516768C (en) * | 2007-11-01 | 2009-07-22 | 北京航空航天大学 | Magnetic bearing sensor controlling system with fault tolerance function |
| 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 |
| CN105737727B (en) * | 2016-02-25 | 2019-03-19 | 珠海格力电器股份有限公司 | Probe of eddy current sensor and eddy current sensor |
| CN108151637B (en) * | 2017-10-24 | 2020-04-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Displacement detection device, magnetic suspension bearing and displacement detection method thereof |
| CN108425945B (en) * | 2018-02-12 | 2019-10-25 | 北京航空航天大学 | One kind is based on double level power amplifier permanent magnet biased hybrid magnetic bearing control systems and without gap sensors detection method |
| CN208224784U (en) * | 2018-05-17 | 2018-12-11 | 成都威尔森科技发展有限责任公司 | A kind of rotating machinery detector |
| CN110030263B (en) * | 2019-04-16 | 2021-04-16 | 青岛大学 | Fault-tolerant control system and method for displacement sensor of active electromagnetic bearing |
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