CN107478248A - A kind of rotary transformer calculation method - Google Patents
A kind of rotary transformer calculation method Download PDFInfo
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- CN107478248A CN107478248A CN201710644728.1A CN201710644728A CN107478248A CN 107478248 A CN107478248 A CN 107478248A CN 201710644728 A CN201710644728 A CN 201710644728A CN 107478248 A CN107478248 A CN 107478248A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses a kind of rotary transformer calculation method, comprise the following steps：Step 1, the two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of outside sine and cosine resolver is received, and two-way string ripple signal is converted into exporting after carrying range information and the data signal of calibration information and initial data；Step 2, the data signal with range information and calibration information exported in receiving step one, and calibration pretreatment is carried out for the initial data in data signal according to range information and calibration information；Step 3, the output angle of rotary transformer is calculated according to formula, wherein calculation formula is as follows：θ 1=arctan (US2S4/US1S3).The rotary transformer calculation method of the present invention, the two paths of signals of rotary transformer output can be effectively collected by the setting of step 1, and by the setting of step 2 and step 3, it can so considerably increase the precision of resolving to calculate after effectively being calibrated to this signal.
Description
Technical field
The present invention relates to a kind of calculation method, more particularly to a kind of rotary transformer calculation method.
Background technology
At present, the measurement of the anglec of rotation, photoelectric encoder and rotary transformer mainly are used.
There is signal conversion unit inside photoelectric encoder, during detection angles, direct numeral letter of the output with angle information
Number.And rotary transformer internal structure is simple, any electronic component is not integrated, it with turning over angle is in certain that its output signal, which is,
The analog signal of functional relation is, it is necessary to which analog signal, which resolve, could obtain angle information.
Rotary transformer angle, which resolves scheme, at present mainly two kinds：The first is to become to resolve chip using special rotation
(RDC chips) carries out hardware decoding；Second is the decoder built using discrete devices such as ADC chips, microprocessors, then
Decoded by software algorithm.
Hard decoder is carried out using RDC chips, for calculation accuracy substantially all in angle classification ' (arc min), calculation accuracy is limited just
Larger limitation can be brought, become for example with the rotation higher to itself precision of RDC chips (rad level ") carries out angle resolving,
Its high-precision feature can not just be brought into play；And RDC chips are not suitable for the electricity of rotary transformer because decoding precision is low
Gas error test；
And use the decoder of the discrete devices such as ADC chips, microprocessor structure to be decoded, due to using signal condition
The discrete devices such as circuit, ADC conversion chips, transmission line, microprocessor build decoder jointly, and its precision index should be system
Precision, it is impossible to simply judge according to the precision of ADC conversion chips.All can in impedance matching, range matching, transmission line
Influence system accuracy.The decoder of discrete device structure traces to the source in system accuracy, it is defective above stability to measure.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the invention to provide a kind of high rotary transformer resolving of precision
Method.
To achieve the above object, the invention provides following technical scheme：A kind of rotary transformer calculation method, including with
Lower step：
Step 1, the two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of outside sine and cosine resolver is received, and will
Two-way string ripple signal is converted into exporting after carrying range information and the data signal of calibration information and initial data, wherein, it is former
Beginning data, range information and calibration information are integrated with address signal；
Step 2, the data signal with range information and calibration information exported in receiving step one, and according to range
Information and calibration information carry out calibration pretreatment for the initial data in data signal, verification initial data, range information and
Address signal in calibration information, initial data, range information and calibration information are extracted and separated, passes through range information afterwards
Initial data is carried out with calibration information to calibrate the fundamental wave virtual value and the voltage effective value conduct calculating that extract in initial data
Basic data；
Step 3, the output angle of rotary transformer is calculated according to formula, wherein calculation formula is as follows：
θ 1=arctan (US2S4/US1S3)；
Wherein, above-mentioned θ 1 be outside rotary transformer rotor position angle, US2S4For rotary transformer secondary induction around
Fundamental voltage virtual value between group both end of which, US1S3For the fundamental wave between the other both ends of rotary transformer secondary induction winding
Voltage effective value.
As a further improvement on the present invention, the magnitude of voltage US2S4And US1S3Obtained by two DT digital transmitter measurements.
As a further improvement on the present invention, the calibration pre-treatment step in the step 2 is as follows：
Step 2 one, using the range information and calibration information carried in data signal to the initial data in data signal
It is modified to obtain transient data；
Step 2 two, analytic operation is carried out to the transient data got and obtains the fundamental wave virtual value in data signal；
Wherein, the analytic operation process in step 2 two is as follows：FFT functional operation is called to m transient data, obtained
To the information of fundamental wave：Amplitude, phase, then by amplitude divided by radical sign 2, fundamental wave virtual value is calculated.As entering for the present invention
One step is improved, and the associated electrical parameters in the step 2 include voltage effective value, the fundamental wave virtual value of rotary transformer.
As a further improvement on the present invention, range information and calibration information are utilized in the step 2 one to data signal
The step of interior initial data is modified is as follows：
Step 1, the normal voltage output source of outside is measured, obtained virtual voltage virtual value will be measured and normal voltage is defeated
The range maximum voltage value for going out source does subtraction, obtains calibration information, and using the range of normal voltage output source as range
Information, calibration information and range information are subjected to matching one by one and preserved, forms multigroup amendment data；
Step 2, the effective voltage value in initial data is matched using the range information and calibration information kept
Amendment, the size of the first effective voltage value according in initial data match corresponding range information in multigroup amendment data, it
Effective voltage value in initial data is subtracted to the calibration information of the range information one group of amendment data of formation afterwards；
Step 3, subtraction result is obtained, result of calculation is stored as transient data, completed to the original in data signal
The amendment of beginning data.
Beneficial effects of the present invention, transformation can be rotated with the sine and cosine outside effective receive by setting for step 1
The two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of device, is exported after string ripple signal is effectively then converted into data signal,
And address signal is integrated in initial data, range information and calibration information, it just can so facilitate the later stage in data signal
Data be identified, can be effectively to go out initial data, range according to address signal identification and by the setting of step 2
Information and calibration information, calibration adjustment then is carried out to initial data using range information and calibration information, after getting adjustment
Voltage effective value and fundamental wave virtual value, so can be to avoid in the prior art when data transfer, deviation occur and leading
The problem of last calculation accuracy caused reduces, finally by the setting of step 3, just can effectively calculate selection transformer
Output angle, complete in whole solution process, and pass through the setting of the formula in step 3, it is possible to it is effective using pair
It is divided by between two secondary Exciting Windings for Transverse Differential Protection voltage and then carries out the mode of arctangent computation, can be effectively to calculate rotor
Position angle is rotary transformer output angle, due to there was only division and arctangent computation during being calculated in said process, because
This calculating process is simple, can effectively save the computing resource of host computer, and compared to using RDC chips in the prior art
The calculation of hard decoder is carried out, calculating process is equally simple, and precision is higher.
Embodiment
A kind of rotary transformer calculation method of the present embodiment, comprises the following steps：
Step 1, the two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of outside sine and cosine resolver is received, and will
Two-way string ripple signal is converted into exporting after carrying range information and the data signal of calibration information and initial data, wherein, it is former
Beginning data, range information and calibration information are integrated with address signal；
Step 2, the data signal with range information and calibration information exported in receiving step one, and according to range
Information and calibration information carry out calibration pretreatment for the initial data in data signal, verification initial data, range information and
Address signal in calibration information, initial data, range information and calibration information are extracted and separated, passes through range information afterwards
Initial data is carried out with calibration information to calibrate the fundamental wave virtual value and the voltage effective value conduct calculating that extract in initial data
Basic data；
Step 3, the output angle of rotary transformer is calculated according to formula, wherein calculation formula is as follows：
θ 1=arctan (US2S4/US1S3)；
Wherein, above-mentioned θ 1 be outside rotary transformer rotor position angle, US2S4For rotary transformer secondary induction around
Effective voltage value between group both end of which, US1S3For the effective voltage between the other both ends of rotary transformer secondary induction winding
Value, during being resolved using the method for the present embodiment to the output angle of rotary transformer, first by step 1,
The two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of outside sine and cosine resolver is gathered, using separated in the present embodiment
The mode of collection, that is, separate two collectors are set to be connected correspondingly with two Exciting Windings for Transverse Differential Protection of rotary transformer,
Such two collector cans are separate to be acquired, and so just can be good at avoiding occurring in the prior art same
Interfered between two data caused by step gathers the data of two Exciting Windings for Transverse Differential Protection output, and then cause to resolve essence below
The problem of degree reduces, after data are collected, data are divided into initial data, range information and calibration with address signal and believed
Breath, is integrated into a data signal and transfers out afterwards, so facilitates identification the step of below to data, then passes through step
Two setting, initial data, range information and calibration information are identified using address signal, then utilizes range information and calibration
Information carries out calibration process to initial data, handles out fundamental wave virtual value and voltage effective value, for rotary transformer below
The calculating of output angle provides basic data, afterwards by step 3, can be effectively based on using traditional method of indicating the pronunciation of a Chinese character calculation formula original
Voltage effective value in data calculates output angle, and only traditional method of indicating the pronunciation of a Chinese character calculating and division arithmetic in whole calculating process, significantly
Reduce amount of calculation, during such above-mentioned resolving, calibration steps has been carried out for initial data, thus can be with
Avoid occurring in the prior art well during data transfer, calculation result caused by deviation occur in data is not smart enough
The problem of quasi-, so greatly improve the precision of rotary transformer angle resolving.As a kind of improved specific embodiment party
Formula, the calibration pre-treatment step in the step 2 are as follows：
Step 2 one, using the range information and calibration information carried in data signal to the initial data in data signal
It is modified to obtain transient data；
Step 2 two, analytic operation is carried out to the transient data got and obtains the fundamental wave virtual value in data signal；
Wherein, the analytic operation process in step 2 two is as follows：FFT functional operation is called to m transient data, obtained
To the information of fundamental wave：Amplitude, phase, then by amplitude divided by radical sign 2, fundamental wave virtual value is calculated, passes through step 2 one
Set, can obtain transient data to be effectively modified to initial data, avoid deviation occur during transmitting data
Caused the problem of precision reduces below, then by the setting of step 2 two, base can be calculated using this transient data
Ripple virtual value, the characteristic value as the identification of later stage host computer are used as calibration basis, and by the way that m transient data is carried out
FFT functional operation is called, then by amplitude divided by radical sign 2, calculates fundamental wave virtual value, can be using transient data as discrete letter
Number calculated, and transient data can effectively reflect the overall condition of initial data in data signal, such basis has
Valid value just can be good at as calibration basis.
As a kind of improved embodiment, the magnitude of voltage US2S4And US1S3Measured by two DT digital transmitters
Obtain, during DT digital transmitters measure, it is only necessary to the output voltage of two secondary Exciting Windings for Transverse Differential Protection is directly gathered,
Then the calculation procedure according to built in digital host 2, fundamental voltage virtual value is effectively calculated according to voltage, so greatly
Facilitate the angle calculation of whole rotary transformer.
As a kind of improved embodiment, the associated electrical parameters in the step 2 include rotary transformer
Voltage effective value, fundamental wave virtual value, because the output signal of existing rotary transformer is AC signal, and in the prior art most
The numerical benchmark of AC signal can be embodied, is on the one hand voltage effective value, is on the other hand fundamental wave virtual value, can so be incited somebody to action
Numerical value is calculated based on voltage effective value, and is effectively set by fundamental wave virtual value, can be to be used as steady state data
Preferably to embody the characteristic of data.
As a kind of improved embodiment, using range information and calibration information to numeral in the step 2 one
The step of initial data in signal is modified is as follows：
Step 1, the normal voltage output source of outside is measured, obtained virtual voltage virtual value will be measured and normal voltage is defeated
The range maximum voltage value for going out source does subtraction, obtains calibration information, and using the range of normal voltage output source as range
Information, calibration information and range information are subjected to matching one by one and preserved, forms multigroup amendment data；
Step 2, the effective voltage value in initial data is matched using the range information and calibration information kept
Amendment, the size of the first effective voltage value according in initial data match corresponding range information in multigroup amendment data, it
Effective voltage value in initial data is subtracted to the calibration information of the range information one group of amendment data of formation afterwards；
Step 3, subtraction result is obtained, result of calculation is stored as transient data, completed to the original in data signal
The amendment of beginning data, in range ability, with DT digital transmitter measurement standards source (a kind of normal voltage electric current output instrument)
The normal voltage of output, electric current, obtain our actual measured values of DT digital transmitters 1 and the error of normal voltage electric current.Such as
In 0~10V ranges, normal voltage is 10V, and we are measured to be 10.01V, and 0.01V is exactly error；In 10~50V ranges,
Normal voltage 50V, we are measured to be 50.05V, and error is exactly 0.05V；…….Saved inside digital host service routine
These information (range, error), digital host service routine utilize range information (0~10V；10~50V) and calibration information is (by mistake
Poor 0.01V, 0.05V) initial data (such as 10.01V, 50.05V) in data signal is modified (subtracts error
0.01st, the transient data (10V, 50V) used for user application 0.05) is obtained, can so be passed through with effective realization
The error amount of first data transfer, is then stored, realize directly rejecting error effect, avoid in the prior art by
In the precision finally resolved caused by communication error is not high the problem of.
In summary, the method for the present embodiment, can be effectively to detect that two-way string ripple is believed by the setting of step 1
Number, and by the setting of step 2, effectively two-way string ripple signal can be calibrated, caused during weeding out transmission
Numerical error, so avoid the occurrence of in the prior art because being resolved below caused by error in signals transmission
The problem of rotation angle accuracy is relatively low.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
- A kind of 1. rotary transformer calculation method, it is characterised in that：Comprise the following steps：Step 1, receives the two-way string ripple signal of two Exciting Windings for Transverse Differential Protection output of outside sine and cosine resolver, and by two-way String ripple signal is converted into exporting after carrying range information and the data signal of calibration information and initial data, wherein, original number Address signal is integrated with according to, range information and calibration information；Step 2, the data signal with range information and calibration information exported in receiving step one, and according to range information With calibration information calibration pretreatment, verification initial data, range information and calibration are carried out for the initial data in data signal Address signal in information, initial data, range information and calibration information are extracted and separated, passes through range information and school afterwards Calibration information carries out calibrating the fundamental wave virtual value and the voltage effective value conduct calculating basis that extract in initial data to initial data Data；Step 3, the output angle of rotary transformer is calculated according to formula, wherein calculation formula is as follows：θ 1=arctan (US2S4/US1S3)；Wherein, above-mentioned θ 1 be outside rotary transformer rotor position angle, US2S4For rotary transformer secondary induction winding wherein Fundamental voltage virtual value between both ends, US1S3Fundamental voltage between the other both ends of rotary transformer secondary induction winding has Valid value.
- 2. rotary transformer calculation method according to claim 1, it is characterised in that：The magnitude of voltage US2S4And US1S3By Two DT digital transmitter measurements obtain.
- 3. rotary transformer calculation method according to claim 2, it is characterised in that：Calibration in the step 2 is located in advance It is as follows to manage step：Step 2 one, the initial data in data signal is carried out using the range information and calibration information carried in data signal Amendment obtains transient data；Step 2 two, analytic operation is carried out to the transient data got and obtains the fundamental wave virtual value in data signal；Wherein, walk Analytic operation process in rapid 22 is as follows：FFT functional operation is called to m transient data, obtains the information of fundamental wave：Width Value, phase, then by amplitude divided by radical sign 2, are calculated fundamental wave virtual value.
- 4. rotary transformer calculation method according to claim 3, it is characterised in that：Related electric in the step 2 Parameter includes voltage effective value, the fundamental wave virtual value of rotary transformer.
- 5. rotary transformer calculation method according to claim 4, it is characterised in that：Range is utilized in the step 2 one The step of information and calibration information are modified to the initial data in data signal is as follows：Step 1, the normal voltage output source of outside is measured, by the virtual voltage virtual value that measurement obtains and normal voltage output source Range maximum voltage value do subtraction, obtain calibration information, and using the range of normal voltage output source as range information, Calibration information and range information are carried out into matching one by one to preserve, form multigroup amendment data；Step 2, the fundamental voltage virtual value in initial data is matched using the range information and calibration information kept Amendment, the size of the first fundamental voltage virtual value according in initial data match corresponding range letter in multigroup amendment data Breath, the fundamental voltage virtual value in initial data is subtracted to the calibration information of the range information one group of amendment data of formation afterwards；Step 3, subtraction result is obtained, result of calculation is stored as transient data, completed to the original number in data signal According to amendment.
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| CN110943670A (en) * | 2019-12-30 | 2020-03-31 | 中国科学院电工研究所 | Motor rotor position obtaining method and system |
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