CN103454452A - Signal transmitting method of low-frequency acceleration sensor transmitter - Google Patents
Signal transmitting method of low-frequency acceleration sensor transmitter Download PDFInfo
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- CN103454452A CN103454452A CN2013100178550A CN201310017855A CN103454452A CN 103454452 A CN103454452 A CN 103454452A CN 2013100178550 A CN2013100178550 A CN 2013100178550A CN 201310017855 A CN201310017855 A CN 201310017855A CN 103454452 A CN103454452 A CN 103454452A
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Abstract
The invention discloses a signal transmitting method of a low-frequency acceleration sensor transmitter. Due to the fact that an MEMS dual-shaft acceleration sensor replaces a traditional piezoelectric acceleration sensor to serve as a vibration measuring part of a wind generating set and outputs an analog signal capable of being received by a PLC through current loop transmitting modules, the number of corresponding components can be effectively reduced, and due to the fact that the analogue signal is output to the PLC in a current simulating mode, electromagnetic interference can be effectively avoided.
Description
Technical field
The present invention relates to a kind of sensing transducer, relate in particular to a kind of signal transmitting method of low frequency acceleration sensing transmitter.
Background technology
In the MW class wind turbine group, usually adopt conventional piezoelectric acceleration transducer as the vibration measuring device, piezoelectric accelerometer need to coordinate charge amplifier, signal conditioner to work, and the signal of signal conditioner output not for common PLC the simulating signal (as 0 ~ 10V or 4 ~ 20mA) of energy compatibility, therefore need to do further conversion to signal, increase system cost.And piezoelectric acceleration sensor adopts concentric cable as signal transmission medium, and the anti-bending of concentric cable, anti-ly tie up, low temperature resistivity can be not good, limited its applied environment.Such sensor is voltage-type output in addition, when cable is longer, there will be signal attenuation, affects measuring accuracy, and is easy to be subject to the interference of electromagnetic environment harsh in blower fan and causes precise decreasing even to be damaged.Simultaneously piezoelectric acceleration transducer is insensitive to superlow frequency vibrating (0.1Hz and following), has limited its application at the blower fan structure vibration monitoring.Waterproof, the impact resistance of last piezoelectric accelerometer are general.
Summary of the invention
The objective of the invention is the defect existed for the above-mentioned background technology, provide a kind of MEMS of employing double-axel acceleration sensor replace conventional piezoelectric formula acceleration transducer as the wind power generating set polarimetric element and pass through the signal transmitting method that the electric current loop transmitting module is exported the low frequency acceleration sensing transmitter of PLC.
For achieving the above object, the signal transmitting method of a kind of low frequency acceleration sensing of the present invention transmitter, comprise the steps:
Step 1: utilize the collection of MEMS double-axel acceleration sensor measure the acceleration signal on the both direction of mounting plane and export corresponding analog voltage signal;
Step 2: utilize the signal condition module to carry out filtering, ratio conversion process to the analog voltage signal of exporting;
Step 3: utilize the electric current loop transmitting module to carry out Voltage-current conversion and export corresponding current signal the analog voltage signal that passes through the signal condition resume module;
Step 4: by electric current output interface output current signal to PLC.
In sum, the signal transmitting method of a kind of low frequency acceleration sensing of the present invention transmitter, because adopting the MEMS double-axel acceleration sensor to replace conventional piezoelectric formula acceleration transducer as the wind power generating set polarimetric element and by the acceptable signal form of electric current loop transmitting module output PLC, can be when effectively reducing corresponding device, because adopting the analog current formal output to PLC, so can effectively prevent electromagnetic interference (EMI).
The accompanying drawing explanation
The schematic diagram that Fig. 1 is a kind of low frequency acceleration sensing of the present invention transmitter.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being reached purpose and effect, below hereby exemplify embodiment and coordinate accompanying drawing to be explained in detail.
Refer to Fig. 1, a kind of low frequency acceleration sensing of the present invention transmitter, be arranged on being subject on the monitoring vibration apparatus of wind power generating set, and mutually be electrically connected to transmission of signal with PLC, it comprises a MEMS double-axel acceleration sensor, two signal condition modules, two electric current loop transmitting modules, two electric current loop output interfaces.
Please continue and consult Fig. 1, wherein a signal condition module is arranged between the signal input part of a signal output part (X signal output part) of MEMS double-axel acceleration sensor and an electric current loop transmitting module wherein and realizes being electrically connected to transmission of signal with MEMS double-axel acceleration sensor and an electric current loop transmitting module respectively.
Between another signal output part (Y-terminal) that another signal condition module is arranged on the MEMS double-axel acceleration sensor and the signal input part of another electric current loop transmitting module and realize being electrically connected to transmission of signal with MEMS double-axel acceleration sensor and another electric current loop transmitting module respectively.
A kind of acceleration sensing of the low frequency for Megawatt fan of the present invention transmitter further comprises three protection modules.
Wherein the input end of a protection module is electrically connected to mutually with an electric current loop transmitting module output terminal wherein; The input end of another protection circuit module is electrically connected to mutually with another electric current loop transmitting module module output terminal; The input end of the 3rd protection circuit module passes end with the power transfer module number and mutually is electrically connected to.Because of the setting of protection circuit module, therefore the present invention can effectively resist the glitch that electromagnetic environment harsh in blower fan is brought, particularly can prevent that surge from disturbing.
The MEMS double-axel acceleration sensor is for the acceleration of monitoring the X-direction of its mounting plane and Y-direction and export corresponding analog voltage signal.The mounting plane X-direction of MEMS double-axel acceleration sensor is mutually vertical with Y-direction.
Because of the MEMS double-axel acceleration sensor very sensitive to the ultralow frequency acceleration, or even the characteristic of the constant acceleration of gravity that brings of inclination angle, the measurement demand that can shake in the ultralow frequency that effectively meets on the basis of measuring conventional vibration pylon on affecting most blower fan safety, blade; Simultaneously, the MEMS double-axel acceleration sensor possesses very strong shock-resistant ability.
Particularly, the MEMS double-axel acceleration sensor can monitor the acceleration of the X-direction of its mounting plane and Y-direction and export the analog voltage signal of 0.5 ~ 4.5V, so improved the integrated level of system.It is 1V/g that described MEMS double-axel acceleration sensor adopts output acceleration and the scale factor of output analog voltage signal, and Hz-KHz is 0 ~ 5500Hz, and can bear the MEMS double-axel acceleration sensor up to the impact of 3000g.Described Hz-KHz is the frequency range that 0 ~ 5500Hz can cover each monitoring point of blower fan.
Two signal condition modules are carried out filtering, ratio conversion process output for the analog voltage signal that the MEMS double-axel acceleration sensor is sent into.Concrete, the signal condition module, when carrying out the ratio conversion, is sent the MEMS double-axel acceleration sensor into 0.5 ~ 4.5V analog voltage signal and is converted 1 ~ 5V analog voltage signal to.
The electric current loop transmitting module can complete the conversion of analog voltage signal to the analog current signal that meets the PLC demand independently of one another, and transmits analog current signal by an electric current output interface to PLC respectively.Concrete, electric current loop transmitting module energy complete independently 1 ~ 5V analog voltage signal is to the conversion of 4 ~ 20mA analog current signal.Therefore the final signal output form of the present invention is 4 ~ 20mA analog current signal of accepting for common PLC, and form the situation of signal fading badly can avoid former Distance Transmission the time simultaneously.
Concrete, electric current loop transmitting module inside possesses mutual conductance and is set to 4mS current-series negative-feedback circuit.Because the current-series negative-feedback circuit is known in the industry technology, again repeat no more.
The present invention further comprises a power transfer module, electric power when this power transfer module is used for providing work to MEMS double-axel acceleration sensor, signal condition module and electric current loop transmitting module.
The signal transmitting method device of a kind of low frequency acceleration sensing of the present invention transmitter comprises the steps:
Step 1: utilize the collection of MEMS double-axel acceleration sensor measure the acceleration signal on the both direction of mounting plane and export corresponding analog voltage signal;
Step 2: utilize the signal condition module to carry out filtering, ratio conversion process to the analog voltage signal of exporting;
Step 3: utilize the electric current loop transmitting module to carry out Voltage-current conversion and export corresponding current signal the analog voltage signal that passes through the signal condition resume module;
Step 4: by electric current output interface output current signal to PLC.
In described step 1, the scope of the analog voltage signal of MEMS double-axel acceleration sensor output is 0.5 ~ 4.5V.
The analog voltage that in described step 2, the signal condition module is sent into the MEMS double-axel acceleration sensor carries out corresponding ratio conversion by 0.5 ~ 4.5V to 1 ~ 5V.
In described step 3, the electric current loop transmitting module possesses current-series negative-feedback circuit that a mutual conductance is 4mS to take the scope of the analog current signal of guaranteeing the output of electric current loop transmitting module is 4 ~ 20mA.
In sum, the signal transmitting method of a kind of low frequency acceleration sensing of the present invention transmitter, because adopting the MEMS double-axel acceleration sensor to replace conventional piezoelectric formula acceleration transducer as the wind power generating set polarimetric element and by the acceptable signal form of electric current loop transmitting module output PLC, can be when effectively reducing corresponding device, because adopting the analog current formal output to PLC, so can effectively prevent electromagnetic interference (EMI).
Above-described technical scheme is only the preferred embodiment of the signal transmitting method of a kind of low frequency acceleration sensing of the present invention transmitter, within the scope of the claim that any equivalent transformation of doing on the signal transmitting method basis of a kind of low frequency acceleration sensing of the present invention transmitter or replacement are included in this patent.
Claims (4)
1. the signal transmitting method of a low frequency acceleration sensing transmitter, comprise the steps:
Step 1: utilize the collection of MEMS double-axel acceleration sensor measure the acceleration signal on the both direction of mounting plane and export analog voltage signal to the signal condition module;
Step 2: utilize the signal condition module to carry out exporting to the electric current loop transmitting module after filtering, ratio conversion process to the analog voltage signal of exporting;
Step 3: utilize the electric current loop transmitting module to carry out analog voltage-analog current to analog voltage signal and change and export analog current signal;
Step 4: by electric current loop output interface output current signal to PLC.
2. signal transmitting method according to claim 1 is characterized in that: in described step 1, the scope of the analog voltage signal of MEMS double-axel acceleration sensor output is 0.5 ~ 4.5V.
3. signal transmitting method according to claim 2 is characterized in that: the voltage that in described step 2, the signal condition module is sent into the MEMS double-axel acceleration sensor carries out corresponding ratio conversion by 0.5 ~ 4.5V to 1 ~ 5V.
4. signal transmitting method according to claim 1 is characterized in that: in described step 3, the scope of the current signal of electric current loop transmitting module output is 4 ~ 20mA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100178550A CN103454452A (en) | 2013-01-17 | 2013-01-17 | Signal transmitting method of low-frequency acceleration sensor transmitter |
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| CN2013100178550A CN103454452A (en) | 2013-01-17 | 2013-01-17 | Signal transmitting method of low-frequency acceleration sensor transmitter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164377A1 (en) * | 2000-05-26 | 2001-12-19 | Sequoia Automation S.R.L. | Monoaxial biaxial, triaxial accelerometer with a signal analysis processor and output adapted to be connected to a PLC |
| CN102155989A (en) * | 2011-03-11 | 2011-08-17 | 成都阜特科技有限公司 | Vibration analyzer for wind-driven generator |
| CN102539831A (en) * | 2012-02-17 | 2012-07-04 | 北京航天自动控制研究所 | Signal conversion device for accelerometer in strapdown inertial navigation system |
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2013
- 2013-01-17 CN CN2013100178550A patent/CN103454452A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164377A1 (en) * | 2000-05-26 | 2001-12-19 | Sequoia Automation S.R.L. | Monoaxial biaxial, triaxial accelerometer with a signal analysis processor and output adapted to be connected to a PLC |
| CN102155989A (en) * | 2011-03-11 | 2011-08-17 | 成都阜特科技有限公司 | Vibration analyzer for wind-driven generator |
| CN102539831A (en) * | 2012-02-17 | 2012-07-04 | 北京航天自动控制研究所 | Signal conversion device for accelerometer in strapdown inertial navigation system |
Non-Patent Citations (2)
| Title |
|---|
| 赵金荣: "PLC模拟量输入通道及其在数据采集处理中的应用", 《上海应用技术学院学报》 * |
| 韩东升等: "基于红外传感器的气体检测系统的设计", 《自动化技术与应用》 * |
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Application publication date: 20131218 |