CN212808330U - Rotating speed measuring circuit - Google Patents
Rotating speed measuring circuit Download PDFInfo
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- CN212808330U CN212808330U CN202022347402.2U CN202022347402U CN212808330U CN 212808330 U CN212808330 U CN 212808330U CN 202022347402 U CN202022347402 U CN 202022347402U CN 212808330 U CN212808330 U CN 212808330U
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Abstract
The utility model provides a rotational speed measuring circuit, this circuit include signal acquisition circuit, signal generation circuit and signal processing circuit. The signal acquisition circuit is used for acquiring the peak voltage and the trough voltage of the key phase signal; the signal generating circuit is used for generating a reference signal according to the peak voltage and the trough voltage of the key phase signal, and the threshold voltage of the reference signal is matched with the peak voltage and the trough voltage of the key phase signal; and the signal processing circuit is used for comparing the key phase signal with the reference signal and calculating the period value of the key phase signal to obtain the rotating speed value. Thus, the threshold voltage of the reference signal is determined according to the peak voltage and the trough voltage of the key phase signal, and is matched with the key phase signal, which is equivalent to adaptively adjusting the reference signal according to the key phase signal. In this way, the amplitude of the key phase signal can be automatically adapted to accommodate different types of key phase signals.
Description
Technical Field
The utility model relates to an equipment monitoring technology field especially relates to a rotational speed measuring circuit.
Background
A Turbine monitoring system (TSI) can monitor, analyze, and alarm the operating state of a large rotating machine. The TSI can monitor information such as vibration, displacement, rotating speed and the like of the machine through a sensor and a signal processing device. Based on this information, the TSI can make a determination as to the operating state of the machine. The monitoring of the rotating speed not only can monitor the rotating state of the mechanical equipment, but also can be related to the phase analysis of the vibration signal, and has a great effect in the TSI.
Monitoring of rotation often utilizes a key phase sensor and measurement circuitry to calculate rotational speed. The key phase sensor may detect a groove or a convex key on the measured shaft and generate a pulse signal (i.e., a key phase signal). The measuring circuit can determine the threshold voltage according to the key phase signal and generate a reference signal, so that the key phase signal is processed by the reference signal to obtain the rotating speed of the measured shaft.
Key phase sensors commonly used today include eddy current sensors and magnetoresistive sensors. The key phase signal generated by the eddy current sensor is typically a negative signal, typically a few volts (V) in amplitude. The reluctance signal is generally a sine wave signal, and the amplitude can change with the change of the rotating speed and can reach tens of volts. Because the waveforms and assignments of the key phase signals collected by different sensors are greatly different, the traditional rotating speed measuring circuit cannot adjust the comparison voltage, and cannot be compatible with different key phase signals.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a rotation speed measuring circuit aims at providing a rotation speed measuring device who adapts to different key looks signals.
A rotating speed measuring circuit comprises a signal acquisition circuit, a signal generation circuit and a signal processing circuit;
the signal acquisition circuit is used for acquiring the peak voltage and the trough voltage of the key phase signal;
the signal generating circuit is used for generating a reference signal according to the peak voltage and the trough voltage of the key phase signal, and the threshold voltage of the reference signal is matched with the peak voltage and the trough voltage of the key phase signal;
and the signal processing circuit is used for comparing the key phase signal with the reference signal and calculating the period value of the key phase signal to obtain the rotating speed value.
Optionally, the signal acquisition circuit comprises a peak acquisition circuit and a trough acquisition circuit;
the wave crest acquisition circuit is used for acquiring the wave crest voltage of the key phase signal;
and the wave trough acquisition circuit is used for acquiring the wave trough voltage of the key phase signal.
Optionally, the difference between the peak voltage and the trough voltage is greater than 0.3 volts.
Optionally, the signal generation circuit comprises a threshold calculation circuit;
and the threshold calculation circuit is used for calculating the threshold voltage according to the peak voltage and the trough voltage of the key phase signal.
Optionally, the signal generating circuit includes a digital-to-analog conversion circuit, a selection circuit, and a controller;
the digital-to-analog conversion circuit is used for generating a peak signal and a trough signal; the voltage value of the peak signal is the threshold voltage, or the voltage value of the trough signal is the threshold voltage;
the selection circuit is used for outputting a peak signal or a trough signal;
the controller is configured to calculate a voltage of the peak signal and a voltage of the valley signal according to the threshold voltage, control the digital-to-analog conversion circuit to generate a peak signal and a valley signal, and control the selection circuit to output the peak signal or the valley signal to obtain the reference signal.
Optionally, the selection circuit comprises a first selection circuit and a second selection circuit;
the first selection circuit is used for outputting the peak signal;
the second selection circuit is used for outputting the trough signal;
the controller is configured to turn on the first selection circuit and turn off the second selection circuit, or turn off the first selection circuit and turn on the second selection circuit.
Optionally, the signal processing circuit comprises a signal comparison circuit;
and the signal comparison circuit is used for comparing the reference signal with the key phase signal and outputting a pulse signal.
Optionally, the signal processing circuit further comprises a signal capturing circuit and a rotation speed calculating circuit;
the signal capturing circuit is used for capturing the pulse signal and recording the time for capturing the pulse signal;
and the rotating speed calculating circuit is used for calculating the period of the pulse signal according to the time for capturing the pulse signal to obtain a rotating speed value.
Optionally, the circuit further comprises a signal conditioning circuit;
and the signal conditioning circuit is used for adjusting the peak voltage and the trough voltage of the key phase signal.
Optionally, the signal conditioning circuit comprises a signal clamping circuit;
the signal clamping circuit is used for ensuring that the peak voltage of the key phase signal does not exceed an upper limit voltage value and/or ensuring that the trough voltage of the key phase signal does not exceed a lower limit voltage value.
The utility model provides a rotational speed measuring circuit, this circuit include signal acquisition circuit, signal generation circuit and signal processing circuit. The signal acquisition circuit is used for acquiring the peak voltage and the trough voltage of the key phase signal; the signal generating circuit is used for generating a reference signal according to the peak voltage and the trough voltage of the key phase signal, and the threshold voltage of the reference signal is matched with the peak voltage and the trough voltage of the key phase signal; and the signal processing circuit is used for comparing the key phase signal with the reference signal and calculating the period value of the key phase signal to obtain the rotating speed value. Thus, the threshold voltage of the reference signal is determined according to the peak voltage and the trough voltage of the key phase signal, and is matched with the key phase signal, which is equivalent to adaptively adjusting the reference signal according to the key phase signal. In this way, the amplitude of the key phase signal can be automatically adapted to accommodate different types of key phase signals.
Drawings
To illustrate the technical solutions in the present embodiment or the prior art more clearly, the drawings needed to be used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rotation speed measurement circuit according to an embodiment of the present disclosure;
fig. 2 is another schematic structural diagram of a rotation speed measurement circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the specific drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a rotation speed measurement circuit provided in an embodiment of the present application. The tachometer circuit 100 may include a signal acquisition circuit 110, a signal generation circuit 120, and a signal processing circuit 130.
The signal collecting circuit 110 is connected to the key phase sensor, and may be configured to record a voltage value of the key phase signal at a peak and a voltage value of a valley, that is, collect a peak voltage and a valley voltage of the key phase signal, so as to determine an amplitude of the key phase signal, so as to determine a reference signal corresponding to the key phase signal.
The signal generating circuit 120 is connected to the signal acquiring circuit 110, and can generate a reference signal according to the peak voltage and the trough voltage of the key phase signal acquired by the signal acquiring circuit 110. The threshold voltage of the reference signal matches the peak and valley voltages of the key phase signal. That is, the signal generation circuit 120 determines the threshold voltage of the reference signal from the voltage value of the peak and the voltage value of the trough of the key phase signal, and generates the corresponding reference signal. Thus, the generated reference signal is matched with the amplitude of the key phase signal, and can be used for processing the key phase signal.
The signal processing circuit 130 is connected to the key phase sensor and signal generating circuit 120, and can receive the key phase signal generated by the key phase sensor and the reference signal generated by the signal generating circuit 120 and process the key phase signal using the reference signal. Since the key phase signal is an analog signal that the key phase sensor is directly generating, there may be a large amount of interference signals. Then the key phase signal is processed by the reference signal, so that the interference factors in the key phase signal can be filtered out, and the rotating speed of the measured shaft can be determined according to the key phase signal.
The utility model provides a rotational speed measuring circuit, this circuit include signal acquisition circuit, signal generation circuit and signal processing circuit. The signal acquisition circuit is used for acquiring the peak voltage and the trough voltage of the key phase signal; the signal generating circuit is used for generating a reference signal according to the peak voltage and the trough voltage of the key phase signal, and the threshold voltage of the reference signal is matched with the peak voltage and the trough voltage of the key phase signal; and the signal processing circuit is used for comparing the key phase signal with the reference signal and calculating the period value of the key phase signal to obtain the rotating speed value. Thus, the threshold voltage of the reference signal is determined according to the peak voltage and the trough voltage of the key phase signal, and is matched with the key phase signal, which is equivalent to adaptively adjusting the reference signal according to the key phase signal. In this way, the amplitude of the key phase signal can be automatically adapted to accommodate different types of key phase signals.
In some possible implementations, the peak voltage and the trough voltage of the key-phase signal may be collected by two different circuits, respectively. That is, the signal acquisition circuit 110 includes a peak acquisition circuit and a valley acquisition circuit. The peak collecting circuit is used for recording the voltage value of the peak of the key phase signal, and the trough collecting circuit is used for recording the voltage value of the trough of the key phase signal.
Because the key phase signal is an analog signal generated by the key phase sensor and is influenced by the external environment, the key phase signal may fluctuate to a certain extent, and in order to ensure the accuracy of the key phase signal and improve the anti-interference capability of the key phase signal, the difference between the peak voltage and the trough voltage can be larger than 0.3V. That is, the signal acquisition circuit 110 records the valley voltage value when detecting a voltage value lower than the peak voltage value by 0.3V, or records the peak voltage value when detecting a voltage value higher than the valley voltage value by 0.3V.
In some possible implementations, the signal generating circuit 120 may include a threshold calculating circuit, and the threshold calculating circuit may include a module having a data processing capability, such as a Central Processing Unit (CPU) or a Field Programmable Gate Array (FPGA). Based on this, the threshold calculation circuit may determine a threshold voltage that matches the peak voltage and the trough voltage of the key phase signal, thereby generating the reference signal.
In some possible implementations, the signal generation circuit 120 may generate the reference signal directly from the threshold voltage using a module having data processing capabilities. In some other implementations, the signal generation circuit 120 may generate the reference signal through a digital-to-analog converter and a selection circuit.
Specifically, the signal generation circuit 120 may include a digital-to-analog conversion circuit, a selection circuit, and a controller. The controller may be a module having a data processing capability in the threshold calculation circuit, or may be an independent module. The controller can calculate the voltage of the peak signal or the voltage of the trough signal according to the threshold voltage and control the digital-to-analog conversion circuit to respectively generate the peak signal and the trough signal. The selection circuit is connected with the digital-to-analog conversion circuit, plays a role of an analog switch, and selects one signal from two signals of a wave crest signal and a wave trough signal to output. The controller may control the selection circuit to output the peak signal and the valley signal.
In some possible implementations, the selection circuit may include a first selection circuit and a second selection circuit. The first selection circuit is used for outputting a peak signal, and the second selection circuit is used for outputting a trough signal. Thus, when a high-level reference signal needs to be generated, the controller can turn on the first selection circuit and turn off the second selection circuit, and output a high-level peak signal as the reference signal; when the reference signal of low level needs to be generated, the controller may turn off the first selection circuit and turn on the second selection circuit, and output the valley signal of low level as the reference signal. In this manner, by controlling the first selection circuit and the second selection circuit, a reference signal that varies periodically can be generated.
In some possible implementation manners, the controller may further adjust the schmitt hysteresis interval according to the actual configuration or configuration information, and further adjust the reference signal, thereby improving the anti-interference capability.
In some possible implementations, the signal processing circuit 130 may include a signal comparison circuit for comparing the reference signal and the key phase signal to obtain the pulse signal. The signal comparison circuit may be a comparator composed of an operational amplifier, or may be a module having data processing capability such as a CPU. The signal comparison circuit can compare the levels of the key phase signal and the reference signal to obtain a pulse signal.
The signal processing circuit 130 may further include a signal capturing circuit and a rotational speed calculating circuit. The signal capturing circuit is used for capturing high-level pulses in the pulse signals obtained by the lightering comparator and recording the time for capturing the high-level pulses. And the rotating speed calculating circuit is used for calculating the period of the pulse signal, namely the period of the key phase signal according to the time for capturing the high-level pulse, and finally obtaining the rotating speed value of the measured shaft.
In some possible implementations, the key phase signals may be adjusted first, considering that the different types of key phase signals have large amplitude differences. Specifically, as shown in fig. 2, the rotation speed measurement circuit 140 may include a signal conditioning circuit 140 for adjusting the peak voltage and the trough voltage of the key-phase signal. The key phase signal generated by the key phase sensor 200 may be conditioned by the signal conditioning circuit 140 and then input to the signal acquisition circuit 110 and the signal measurement circuit for processing 130. In this manner, the circuit is further able to accommodate different types of key phase signals.
In some possible implementations, the signal conditioning circuit 140 may include a signal clamping circuit. The signal clamping circuit ensures that a peak voltage of the key phase signal does not exceed an upper limit voltage value and/or ensures that a trough voltage of the key phase signal does not exceed a lower limit voltage value.
It should be noted that the present invention provides a rotation speed measuring circuit, which can be used for measuring the rotation speed of a measured shaft (or other rotating components), and can also be used for vibration monitoring or axial distortion monitoring, and other applications, and the present invention is not limited thereto.
It is well within the skill of those in the art to implement, without further elaboration, the present invention which relates to circuits and electronic components and control strategies that are all prior art, and which are not related to software and methodology improvements.
It is right above the utility model provides a rotational speed measurement circuit has carried out the detailed introduction, to the general technical personnel in this field, the foundation the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (10)
1. A rotating speed measuring circuit is characterized by comprising a signal acquisition circuit, a signal generation circuit and a signal processing circuit;
the signal acquisition circuit is used for acquiring the peak voltage and the trough voltage of the key phase signal;
the signal generating circuit is used for generating a reference signal according to the peak voltage and the trough voltage of the key phase signal, and the threshold voltage of the reference signal is matched with the peak voltage and the trough voltage of the key phase signal;
and the signal processing circuit is used for comparing the key phase signal with the reference signal and calculating the period value of the key phase signal to obtain the rotating speed value.
2. The circuit of claim 1, wherein the signal acquisition circuit comprises a peak acquisition circuit and a valley acquisition circuit;
the wave crest acquisition circuit is used for acquiring the wave crest voltage of the key phase signal;
and the wave trough acquisition circuit is used for acquiring the wave trough voltage of the key phase signal.
3. The circuit of claim 2, wherein the difference between the peak voltage and the valley voltage is greater than 0.3 volts.
4. The circuit of claim 1, wherein the signal generation circuit comprises a threshold calculation circuit;
and the threshold calculation circuit is used for calculating the threshold voltage according to the peak voltage and the trough voltage of the key phase signal.
5. The circuit of claim 4, wherein the signal generation circuit comprises a digital-to-analog conversion circuit, a selection circuit, and a controller;
the digital-to-analog conversion circuit is used for generating a peak signal and a trough signal; the voltage value of the peak signal is the threshold voltage, or the voltage value of the trough signal is the threshold voltage;
the selection circuit is used for outputting a peak signal or a trough signal;
the controller is configured to calculate a voltage of the peak signal and a voltage of the valley signal according to the threshold voltage, control the digital-to-analog conversion circuit to generate a peak signal and a valley signal, and control the selection circuit to output the peak signal or the valley signal to obtain the reference signal.
6. The circuit of claim 5, wherein the selection circuit comprises a first selection circuit and a second selection circuit;
the first selection circuit is used for outputting the peak signal;
the second selection circuit is used for outputting the trough signal;
the controller is configured to turn on the first selection circuit and turn off the second selection circuit, or turn off the first selection circuit and turn on the second selection circuit.
7. The circuit of claim 1, wherein the signal processing circuit comprises a signal comparison circuit;
and the signal comparison circuit is used for comparing the reference signal with the key phase signal and outputting a pulse signal.
8. The circuit of claim 7, wherein the signal processing circuit further comprises a signal capture circuit and a speed calculation circuit;
the signal capturing circuit is used for capturing the pulse signal and recording the time for capturing the pulse signal;
and the rotating speed calculating circuit is used for calculating the period of the pulse signal according to the time for capturing the pulse signal to obtain a rotating speed value.
9. The circuit of claim 1, further comprising a signal conditioning circuit;
and the signal conditioning circuit is used for adjusting the peak voltage and the trough voltage of the key phase signal.
10. The circuit of claim 9, wherein the signal conditioning circuit comprises a signal clamping circuit;
the signal clamping circuit is used for ensuring that the peak voltage of the key phase signal does not exceed an upper limit voltage value and/or ensuring that the trough voltage of the key phase signal does not exceed a lower limit voltage value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022347402.2U CN212808330U (en) | 2020-10-20 | 2020-10-20 | Rotating speed measuring circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022347402.2U CN212808330U (en) | 2020-10-20 | 2020-10-20 | Rotating speed measuring circuit |
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| CN212808330U true CN212808330U (en) | 2021-03-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089036A (en) * | 2021-11-09 | 2022-02-25 | 许继集团有限公司 | Key phase pulse intelligent acquisition device and acquisition method thereof |
| CN115237037A (en) * | 2022-09-22 | 2022-10-25 | 长江三峡能事达电气股份有限公司 | Synchronous acquisition and processing method and system for speed regulator on-line monitoring analog signals |
-
2020
- 2020-10-20 CN CN202022347402.2U patent/CN212808330U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089036A (en) * | 2021-11-09 | 2022-02-25 | 许继集团有限公司 | Key phase pulse intelligent acquisition device and acquisition method thereof |
| CN114089036B (en) * | 2021-11-09 | 2024-04-16 | 许继集团有限公司 | Key phase pulse intelligent acquisition device and acquisition method thereof |
| CN115237037A (en) * | 2022-09-22 | 2022-10-25 | 长江三峡能事达电气股份有限公司 | Synchronous acquisition and processing method and system for speed regulator on-line monitoring analog signals |
| CN115237037B (en) * | 2022-09-22 | 2023-09-26 | 能事达电气股份有限公司 | Synchronous acquisition and processing method and system for on-line monitoring analog signals of speed regulator |
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