CN105137235A - Rotary transformer electric bridge function detection method - Google Patents
Rotary transformer electric bridge function detection method Download PDFInfo
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- CN105137235A CN105137235A CN201510536630.5A CN201510536630A CN105137235A CN 105137235 A CN105137235 A CN 105137235A CN 201510536630 A CN201510536630 A CN 201510536630A CN 105137235 A CN105137235 A CN 105137235A
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Abstract
The invention discloses a rotary transformer electric bridge function detection method, comprising: utilizing a transformer to respectively connect high end low ends of a certain isolated frequency sinusoidal signal to the input terminal of a rotary transformer electric bridge; simulating sine-cosine input signals of characteristic angles of 0 DEG, 45 DEG, 90 DEG, 135 DEG, 180 DEG, 225 DEG, 270 DEG, and 315 DEG; measuring an angle display value after balance of the rotary transformer electric bridge; calculating the difference between the display angle value of the rotary transformer electric bridge and a simulated characteristic angle value; and estimating whether the measuring precision of the rotary transformer electric bridge meets use requirements. The rotary transformer electric bridge function detection method is simple and effective, can be used when a higher procession sine-cosine signal emulator is not available for the calibration of a high precision rotary transformer electric bridge, and also can be used when other rotary transformer electrical precision measuring instruments perform period check or fault analysis.
Description
Technical field
The present invention relates to a kind of function detecting method of rotary transformer electric bridge, particularly for the measuring method of characteristic angle.
Background technology
Rotary transformer electric bridge is used to the major equipment measuring sine and cosine resolver electrical error, and the precision measure of usual rotary transformer electric bridge is the sine and the cosine output signal that utilize sine and cosine resolver emulator to simulate sine and cosine resolver.The precision of the sine and cosine output signal of emulator can be used for detecting the precision of rotary transformer electric bridge when being not less than 1/3 of rotary transformer electric bridge precision.When emulator precision lower than or the precision of equivalent rotary transformer electric bridge time can not be used for detecting the precision of rotary transformer electric bridge.The 540/10 rotary transformer electric bridge that North Atlantic Ocean company of the U.S. produces, precision 2 ", be the rotary transformer electric bridge of full accuracy both at home and abroad at present, domestic a lot of producer all buys the measuring equipment of this equipment as sine and cosine resolver electrical error.The 5300 emulator precision that the said firm produces simultaneously are also 2 "; be generally used for measuring the precision of sine and cosine resolver analog to digital conversion circuit; can not as the precision measure equipment of 540/10 rotary transformer electric bridge, so 540/10 rotary transformer electric bridge precision measure does not at home have solution so far.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art part, a kind of function detecting method of characteristic angle precision is proposed, the method is the cosine and sine signal feature utilizing characteristic angle, is assessed the precision of electric bridge by measurement rotary transformer electric bridge in the precision of characteristic angle.
Technical solution of the present invention is:
A function detecting method for rotary transformer electric bridge, is characterized in that comprising the following steps:
Step one, sinusoidal signal connect the input end of the transformer that input end and output end signal are isolated, simultaneously by the reference edge of shielding line access phase sensitivity voltage table;
Step 2, cosine and sine signal requirement simulation cosine and sine signal by characteristic angle, by the input end of the output terminal of transformer access rotary transformer electric bridge;
The output terminal of step 3, rotary transformer electric bridge connects the signal end of phase sensitivity voltage table by shielding line;
Step 4, the knob rotated on rotary transformer electric bridge, make phase sensitivity voltage table output valve minimum;
Step 5, employing maximum deviation method calculate the measuring accuracy of rotary transformer electric bridge.
Described step one sinusoidal signal can be the sinusoidal signal that sinusoidal signal generator produces, also can AC power in other forms produce, its sinusoidal waveform degree of distortion is not more than 1%, amplitude range 2V-115V, frequency 400Hz-5KHz, frequency stability is not more than 1%.
Transformer employing voltage ratio 1:1 in described step one, the power transformer that primary and secondary coil turn is equal.
In described step 2, two ends and the different connected modes of rotary transformer electric bridge input end of transformer output signal simulate the standard cosine and sine signal of 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° characteristic angle.
Calculate the measuring error of each characteristic angle, get the measuring accuracy of maximal value as rotary transformer electric bridge of wherein absolute value,
Δθ＝θ-θ
0
In formula: θ
0---point of theory (°);
θ---actual measurement angle (°);
Δ θ---rotary transformer electric bridge is at θ
0the error of angle.
The present invention's beneficial effect is compared with prior art:
(1) input signal of rotary transformer electric bridge characteristic angle of the present invention is simulated from the different modes of connection of rotary transformer input end by unique sinusoidal signal, the requirement of the rotary transformer electric bridge accuracy test that the precision of input signal is because being that same sinusoidal signal can think 0 ", meet precision 2 ".Usually, the electrical error of rotary transformer be distributed in 45 °, 90 °, 135 °, 225 °, 270 °, 315 ° of characteristic angle time be in extreme point, so, be the precision that can evaluate rotary transformer electric bridge to the precision measure of rotary transformer electric bridge characteristic angle.
(2) sinusoidal signal of the present invention is through transformer isolation, can reduce the interference of reference signal to the input of rotary transformer electric bridge, output signal.
(3) output signal of reference signal of the present invention and rotary transformer electric bridge adopts shielding line, can effectively reduce the electromagnetic interference (EMI) in test environment.
Accompanying drawing explanation
Fig. 1 is the test schematic diagram of the present invention's 0 ° of characteristic angle.
Embodiment
As shown in Figure 1, the Function detection of rotary transformer electric bridge of the present invention comprises sinusoidal signal 1, transformer 2, phase sensitivity voltage table 3 and rotary transformer electric bridge 4.Sinusoidal signal 1 can be the sinusoidal signal that sinusoidal signal generator produces, and also can be that the AC power of other form produces, require that sinusoidal waveform degree of distortion is not more than 1%, amplitude range 2V-115V, frequency 400Hz-5kHz, frequency stability be not more than 1%.Transformer 2 adopts voltage ratio 1:1, power transformer that primary and secondary coil turn is equal.Phase sensitivity voltage table requires that the relative error of voltage measurement is not more than 1%.The input signal of Ref end and Sig end all needs shielding.
The function detecting method of rotary transformer electric bridge of the present invention comprises the steps:
(1) by shown in Fig. 1, sinusoidal signal 1 is connect the input end of transformer 2, simultaneously by the Ref reference edge of shielding line access phase sensitivity voltage table 3, wherein the Ref+ end of the Ref+ termination phase sensitivity voltage table of sinusoidal signal, the Ref-end of the Ref-termination phase sensitivity voltage table of sinusoidal signal.
(2) by listed by table 1 characteristic angle order, corresponding 0 ° of characteristic angle mode of connection is by the output terminal of transformer 2 access rotary transformer electric bridge 4 input end.
(3) output terminal of rotary transformer electric bridge 4 connects the Sig signal end of phase sensitivity voltage table 3 by shielding line.The wherein Sig+ end of the Hi termination phase sensitivity voltage table 3 of rotary transformer electric bridge 4 output terminal, the Sig-end of the Lo termination phase sensitivity voltage table 3 of rotary transformer electric bridge 4 output terminal.
(4) rotate the knob of on rotary transformer electric bridge 4, make phase sensitivity voltage table 3 output valve minimum, otherwise the mode of connection of rotary transformer electric bridge input end is not corresponding with characteristic angle sine and cosine; When the voltage displayed value of phase sensitivity voltage table is less than 0.1mV, the angle displayed value of record rotary transformer electric bridge 4.
(5) repeat step (2) and (4), listed by table 1 characteristic angle order, the corresponding next characteristic angle mode of connection of order is by the output terminal of transformer 2 access rotary transformer electric bridge 4 input end.Rotate the knob of on rotary transformer electric bridge 4, make phase sensitivity voltage table 3 output valve minimum; When the voltage displayed value of phase sensitivity voltage table is less than 0.1mV, the angle displayed value of record rotary transformer electric bridge 4, until all tested all characteristic angle listed by table 1.
(6) error of each characteristic angle is calculated by formula (1), adopt maximum deviation method, calculate the measuring error of each characteristic angle for the actual measurement angle value of all characteristic angle listed by table 1 by formula (1), get the measuring accuracy of maximal value as rotary transformer electric bridge 4 of wherein absolute value.
Δθ＝θ-θ
0………………………………………………(1)
In formula: θ
0---point of theory (°);
θ---actual measurement angle (°);
Δ θ---rotary transformer electric bridge 4 is at θ
0the error of angle.
The mode of connection of the input end of transformer output signal and rotary transformer electric bridge is set according to characteristic angle sine and cosine feature in described step (2), the mode of connection that different characteristic angle is corresponding different, table 1 is the corresponding relation of characteristic angle and the rotary transformer electric bridge input end mode of connection.
The corresponding relation of table 1 characteristic angle and the rotary transformer electric bridge input end mode of connection
Embodiment:
For the accuracy test of the 540/10 rotary transformer electric bridge that the North Atlantic Ocean produces, adopt method of testing of the present invention.Wherein sinusoidal signal adopts the XD1B low frequency generator that Tianjin Zhong Huan tech company produces, and output signal is adjusted to amplitude 4V, frequency 400Hz.2250 digital analyser that phase sensitivity voltage table adopts the North Atlantic Ocean to produce.Table 2 is certain rotary transformer electric bridge Function detection data and data processed result.
The unexposed content of the present invention is known to the skilled person general knowledge.
Claims (5)
1. a function detecting method for rotary transformer electric bridge, is characterized in that comprising the following steps:
Step one, sinusoidal signal (1) connect the input end of the transformer (2) that input end and output end signal are isolated, simultaneously by the reference edge of shielding line access phase sensitivity voltage table (3);
Step 2, by characteristic angle cosine and sine signal requirement simulation cosine and sine signal, by the output terminal of transformer (2) access rotary transformer electric bridge (4) input end;
The output terminal of step 3, rotary transformer electric bridge (4) connects the signal end of phase sensitivity voltage table (3) by shielding line;
Step 4, the knob rotated on rotary transformer electric bridge (4), make phase sensitivity voltage table (3) output valve minimum;
Step 5, employing maximum deviation method calculate the measuring accuracy of rotary transformer electric bridge (4).
2. the function detecting method of a kind of rotary transformer electric bridge according to claim 1, it is characterized in that: described step one sinusoidal signal can be the sinusoidal signal that sinusoidal signal generator produces, also can AC power in other forms produce, its sinusoidal waveform degree of distortion is not more than 1%, amplitude range 2V-115V, frequency 400Hz-5KHz, frequency stability is not more than 1%.
3. the function detecting method of a kind of rotary transformer electric bridge according to claim 1, is characterized in that: the transformer employing voltage ratio 1:1 in described step one, the power transformer that primary and secondary coil turn is equal.
4. the function detecting method of a kind of rotary transformer electric bridge according to claim 1, is characterized in that: the standard cosine and sine signal of 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° characteristic angle is simulated from the different connected modes of rotary transformer electric bridge (4) input end in the two ends that in described step 2, transformer (2) outputs signal.
5. the function detecting method of a kind of rotary transformer electric bridge according to claim 4, is characterized in that: the measuring error calculating each characteristic angle, gets the measuring accuracy of maximal value as rotary transformer electric bridge (4) of wherein absolute value,
Δθ＝θ-θ
0
In formula: θ
0---point of theory (°);
θ---actual measurement angle (°);
Δ θ---rotary transformer electric bridge is at θ
0the error of angle.
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| CN201510536630.5A CN105137235B (en) | 2015-08-27 | 2015-08-27 | A kind of function detecting method of rotary transformer electric bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280404A (en) * | 2021-12-24 | 2022-04-05 | 北京七星飞行电子有限公司 | Angle division testing system and testing method of Scott transformer |
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2015
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| CN101210821A (en) * | 2006-12-28 | 2008-07-02 | 中国航天时代电子公司第十六研究所 | Coarse-fine data coupling method for double passage shaft angle conversion and measurement |
| CN201194019Y (en) * | 2007-12-05 | 2009-02-11 | 比亚迪股份有限公司 | Rotary transformer detection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280404A (en) * | 2021-12-24 | 2022-04-05 | 北京七星飞行电子有限公司 | Angle division testing system and testing method of Scott transformer |
| CN114280404B (en) * | 2021-12-24 | 2024-02-06 | 北京七星飞行电子有限公司 | Angle testing system and angle testing method for Scott transformer |
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Effective date of registration: 20220930 Address after: Room 411, 4th floor, building 3, yard 7, Shixing street, Shijingshan District, Beijing 100043 Patentee after: Beijing Aerospace Wanrun High Tech Co.,Ltd. Address before: 142 box 403, box 100854, Beijing, Beijing, Haidian District Patentee before: BEIJIGN INSTITUTE OF AEROSPACE CONTROL DEVICES |