CN103023497B - The digital signal of selsyn module and analog signal conversion accuracy method of testing - Google Patents

Abstract

The digital signal of selsyn module and analog signal conversion accuracy method of testing, the invention discloses a kind of described selsyn module and comprise virtual instrument operating surface, angle to digital quantizer RDC and numeral to angle converter DRC; Virtual instrument operation interface controls RDC, DRC circuit; Use instant invention overcomes in the past that digital signal is to selsyn outputting analog signal in test process, and selsyn outputting analog signal converts the defect that in digital signal processes, conversion accuracy cannot be verified to.

Description

The digital signal of selsyn module and analog signal conversion accuracy method of testing

Technical field

The present invention relates to the technical field that the analog quantity of angle or displacement and digital quantity are changed mutually, particularly relate to a kind of digital signal and analog signal conversion accuracy method of testing of selsyn module.

Background technology

Some control device of modern control system usually need to use this analog quantity of angle, angular surveying is applied very extensive in Industry Control, but due to high accuracy angle measuring instrument more complicated such as selsyn calibration sources, use inconvenience, and the problems such as volume is large, cost is high, poor universality hamper the detection calibration work of this kind equipment, therefore develop and a kind ofly use universal tester, the easy to operate development of conversion accuracy method of testing to this field significant.

In prior art, selsyn module can be adopted to complete digital signal to the conversion of selsyn outputting analog signal and selsyn outputting analog signal to the conversion of digital signal; Selsyn module mainly comprise virtual instrument operating surface, angle to digital quantizer (RDC) and numeral to angle (DRC); Virtual instrument operation interface controls RDC input circuit, DRC output circuit, and outside source is all connected with RDC input circuit, DRC output circuit; Virtual instrument operating surface comprises numeral to selsyn part and selsyn to numerical portion, as shown in Figure 1, numeral comprises angle input frame and angle output button to the operation interface of selsyn part, and selsyn comprises angle measurement button and angle display box to numerical portion;

Digital signal to the flow path switch of selsyn outputting analog signal is: by the angle input frame input angle of virtual instrument operating surface to DRC, DRC converts the digital signal that input angle represents to analog signal with reference to the signal of outside source, is exported by the output S1 to S3 of DRC;

The flow path switch that selsyn outputting analog signal converts digital signal to is: receive external analog signal by the input S1 to S3 of RDC input circuit, and convert analog signal to digital signal with reference to the signal of outside source and export, and be presented in the angle display box of virtual instrument operating surface.

But exist in prior art and cannot obtain digital signal converts the conversion accuracy of digital signal to problem to selsyn outputting analog signal and selsyn outputting analog signal.

Summary of the invention

The invention provides a kind of selsyn module digital signal and analog signal conversion accuracy method of testing, the method utilizing virtual instrument operation interface and the measurement of selsyn analog signal output to combine verifies that numeral is to selsyn conversion accuracy.

The object of the invention is to be achieved through the following technical solutions:

The digital signal of selsyn module and an analog signal conversion accuracy method of testing, is characterized in that, described selsyn module comprises virtual instrument operating surface, angle to digital quantizer RDC and numeral to angle converter DRC; Virtual instrument operating surface is all connected with RDC, DRC;

Step one: the output arranging outside source is the reference signal that user requires, this reference signal is connected to selsyn RDC and DRC; Described reference signal comprises high-voltage signal RH and low-voltage signal RL;

Step 2: in the numeral of virtual instrument operating surface in the angle input frame of selsyn part, input angle value A to be converted, the angle value A according to input carries out following test:

If a. 0≤A < 60 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, what connect DRC connects S3 output probe, by oscillographic passage 2 probe connect the S3 output of DRC, probe ground connects the S2 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and another connects the S3 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃,

By two of described digital voltmeter probes, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₃₂, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If b. 60 °≤A < 120 °, the probe of oscillographic passage 1 is connected the S3 output of DRC, probe ground connects the S2 output of DRC, the probe of oscillographic passage 2 is connected to the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear;

Then click angle and export button, make the analog quantity of selsyn DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₃₂;

By described digital voltmeter two probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If C. 120 °≤A < 180 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, probe ground connects the S3 output of DRC, the probe of oscillographic passage 2 is connected the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and then digital voltmeter arranges and be operated in ac voltage measurement gear by another S3 output meeting DRC;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃,

By two of described digital voltmeter probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

Step 3: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are homophases in step 2, the formulae discovery actual measurement output angle angle value θ according to below:

If 0≤θ < 60 °:

Then: U ₁₃/ U ₃₂=sin θ/sin (θ+120 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\frac{\sqrt{3}}{2}\frac{U_{13}}{U_{32}}}{1+\frac{U_{13}}{2U_{32}}}\right)$

If 60≤θ < 120 °:

Then: U ₃₂/ U ₂₁=sin (θ+120)/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}(U_{21}+U_{32})}{U_{21}{-U}_{32}}\right)$

If 120≤θ < 180 °:

Then: U ₁₃/ U ₂₁=sin θ/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}{U}_{13}}{{-U}_{13}{-2U}_{21}}\right)$

Step 4: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are anti-phase in step 2, then according to formulae discovery actual measurement output angle angle value θ below:

If 0≤θ < 60 °:

That is:

If 60≤θ < 120 °:

That is:

If 120≤θ < 180 °:

That is:

Step 5: calculate actual measurement output angle angle value θ, obtain numeral to selsyn conversion accuracy according to the difference of actual measurement output angle angle value θ and input angle angle value A;

Step 6: by the output S1 to S3 of DRC, correspondingly with RDC input S1 to S3 connects;

At the selsyn of virtual instrument operating surface to numerical portion, click angle measurement button, the analog quantity that DRC exports is converted to digital quantity by RDC, angle measurement B is demonstrated in the upper angle display box of virtual main interface, then described actual measurement output angle angle value θ is compared calculated difference with angle measurement B and obtain measure error, and then obtain the conversion accuracy of selsyn analog signal to digital signal.

Beneficial effect of the present invention:

1. overcome in the past that digital signal is to selsyn outputting analog signal in test process, and selsyn outputting analog signal converts the defect that in digital signal processes, conversion accuracy cannot be verified to;

2. completed the test of modulating output by 6.5 bit digital multimeters, can verify that numeral is to selsyn output signal accuracy, also demonstrates the precision of virtual instrument analog output signal simultaneously further, ensure that the validity that virtual instrument input signal is tested.

3. this method of testing is easy to operate, reliable operation, certainty of measurement are high, practical, also brings very large facility, have a good application prospect to the gage work of this series products.

Accompanying drawing explanation

Fig. 1 is virtual instrument operation interface schematic diagram;

Fig. 2 is selsyn RDC input schematic diagram;

Fig. 3 is that selsyn test connects block diagram (input angle A scope: 0≤A < 60 °);

Fig. 4 is that selsyn test connects block diagram (input angle A scope: 60 °≤A < 120 °);

Fig. 5 is that selsyn test connects block diagram (input angle A scope: 120 °≤A < 180 °);

Fig. 6 is selsyn principle assumption diagram: a. Lockout winding is electromotive force direction when θ value is 0 °; B. when θ value is 0 ° and pumping signal same-phase electromotive force direction

Embodiment

In order to understand technical scheme of the present invention better, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.

Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.

Step one: the output in signalization source is the reference signal that user requires, is connected to selsyn RDC and DRC by this reference signal; Described reference signal comprises high-voltage signal RH and low-voltage signal RL;

Step 2: in the numeral of virtual instrument operating surface in the angle input frame of selsyn part, input angle angle value A, the angle value A according to input carries out following test:

If a. 0≤A < 60 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, probe ground connects the S3 output of DRC, by oscillographic passage 2 probe connect the S3 output of DRC, probe ground connects the S2 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and another connects the S3 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear; As shown in Figure 3;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃;

By two of described digital voltmeter probes, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₃₂, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If b. 60 °≤A < 120 °, the probe of oscillographic passage 1 is connected the S3 output of DRC, probe ground connects the S2 output of DRC, the probe of oscillographic passage 2 is connected to the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear; As shown in Figure 4;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₃₂;

By described digital voltmeter two probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If C. 120 °≤A < 180 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, probe ground connects the S3 output of DRC, the probe of oscillographic passage 2 is connected the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and then digital voltmeter arranges and be operated in ac voltage measurement gear by another S3 output meeting DRC; As shown in Figure 5;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃,

By two of described digital voltmeter probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

Step 3: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are homophases in step 2, then according to the output angle of modulating output formulae discovery actual measurement below angle value θ:

U ₁₃＝KU _RH-RLsinθ

U ₃₂＝KU _RH-RLsin(θ+120°)

U ₂₁＝KU _RH-RLsin(θ+240°)

U ₁₃, U ₃₂, U ₂₁be respectively the output voltage between the output voltage between the output voltage between S1 and S3 output, S3 and S2 output, S2 and S1 output, θ is actual measurement output angle angle value, U _rH-RLfor input signal voltage (voltage difference between signal RH and signal RL), K is that the attenuation ratio coefficient of selsyn (refers to U _rH-RLwith U ₁₃, U ₃₂and U ₂₁ratio between three's maximum, the U when angle θ is 90 degree ₁₃export maximum, the U when angle θ is 150 degree ₃₂export maximum, the U when angle θ is 30 degree ₂₁export maximum, this attenuation ratio coefficient is fixing after selsyn dispatches from the factory).

Fig. 6 is selsyn principle assumption diagram, and its excitation winding is received on single phase alternating current power supply, is called selsyn transmitter, and the Lockout winding in selsyn stator is all connected into 120 ° of angle three-phase forms.

When accessing single-phase alternating current (i.e. pumping signal) in the excitation winding of synchro transmitter, the surrounding of selsyn all will produce impulsive magnetic field, and its size is in time by sinusoidal rule change.Impulsive magnetic field uses upper synchronous induced electromotive force of each phase winding rise time of synchro transmitter Lockout winding, the size of electromotive force depends on relative position between the axis of each phase winding in Lockout winding and excitation winding axis and the direction of motion, can obtain the modulating output formula that selsyn is above-mentioned.

According to selsyn operation principle, when angle θ is 0 ° ~ 60 °, in selsyn winding, U1-3 and U3-2 and pumping signal same-phase electromotive force direction are that counterclockwise (i.e. positive vector direction) the same-phase electromotive force direction of U21 is clockwise direction (i.e. negative vector direction).And use digital voltmeter to exchange the ac voltage U1-3 of gear actual measurement, U3-2, U2-1 does not reflect electromotive force phase condition and direction vector, can only be on the occasion of, therefore when angle θ is 0 ° ~ 60 ° calculate process electromotive force direction vector can only be adopted to be all the formula to calculating θ angle value of U1-3 and the U3-2 voltage in positive vector direction.Now the phase directional of pumping signal is identical with the electromotive force phase directional of U1-3 with U3-2 signal.Namely, when 0 °≤θ < 60 °, formula (1) and formula (2) is used to participate in calculating; And then obtain:

If 0≤θ < 60 °:

Then: U ₁₃/ U ₃₂=sin θ/sin (θ+120 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\frac{\sqrt{3}}{2}\frac{U_{13}}{U_{32}}}{1+\frac{U_{13}}{2U_{32}}}\right)$

According to same principle, when angle θ is 60 ° ~ 120 °, in selsyn winding, U3-2 and U2-1 and pumping signal same-phase electromotive force direction are clockwise direction (i.e. negative vector direction), and the same-phase electromotive force direction of U21 is counterclockwise (i.e. positive vector direction).And use digital voltmeter to exchange the ac voltage U1-3 of gear actual measurement, U3-2, U2-1 does not reflect electromotive force phase condition and direction vector, can only be on the occasion of, therefore when angle θ is 60-120 calculate process electromotive force direction vector can only be adopted to be all the formula to calculating θ angle value of U3-2 and the U2-1 voltage in negative vector direction.Now the phase directional of pumping signal is contrary with the electromotive force phase directional of U3-2 and U2-1 signal.Namely, when 60≤θ < 120 °, formula (2) and formula (3) is used to participate in calculating; And then obtain:

If 60≤θ < 120 °:

Then: U ₃₂/ U ₂₁=sin (θ+120)/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}(U_{21}+U_{32})}{U_{21}{-U}_{32}}\right)$

According to same principle, when angle θ is 120 ° ~ 180 °, in selsyn winding, U2-1 and U1-3 and pumping signal same-phase electromotive force direction are that counterclockwise (i.e. positive vector direction) the same-phase electromotive force direction of U3-2 is clockwise direction (i.e. negative vector direction).And use digital voltmeter to exchange the ac voltage U1-3 of gear actual measurement, U3-2, U2-1 does not reflect electromotive force phase condition and direction vector, can only be on the occasion of, therefore when angle θ is 120-180 calculate process electromotive force direction vector can only be adopted to be all the formula to calculating θ angle value of U2-1 and the U1-3 voltage in positive vector direction.Now the phase directional of pumping signal is identical with the electromotive force phase directional of U2-1 with U1-3 signal.Namely, when 120≤θ < 180 °, formula (3) and formula (1) is used to participate in calculating; And then obtain:

If 120≤θ < 180 °:

Then: U ₁₃/ U ₂₁=sin θ/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}{U}_{13}}{{-U}_{13}{-2U}_{21}}\right)$

Step 4: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are anti-phase in step 2, then according to formulae discovery actual measurement output angle angle value θ:

If 0≤θ < 60 °:

That is:

If 60≤θ < 120 °:

That is:

If 120≤θ < 180 °:

That is:

Step 5: calculate actual measurement output angle angle value θ, obtain numeral to selsyn conversion accuracy according to the difference of actual measurement output angle angle value θ and input angle angle value A;

Fig. 2 is that selsyn RDC input comprises 3 line input S1 to S3, reference signal input RL and RH; Be 3 line output terminals for selsyn DRC, S1 to S3, RL and RH is also reference signal input;

Further, by the output S1 to S3 of selsyn DRC, correspondingly with selsyn RDC input S1 to S3 to connect;

At the selsyn of virtual instrument operating surface to numerical portion, click angle measurement button, control the conversion of selsyn to numerical portion, angle measurement B is demonstrated in the upper angle display box of virtual main interface, then described actual measurement output angle angle value θ is compared calculated difference with angle measurement B and obtain measure error, and then obtain the conversion accuracy of selsyn to numerical portion; Because angle value θ has been through the accurate output angle angle value of calculating, therefore this difference is the substantial measurement errors of " selsyn → numeral " ALT-CH alternate channel, can be used for checking whether selsyn meets conversion accuracy technical requirement to the conversion of numerical portion.

Also comprise continuous measurement button at the selsyn of virtual instrument operating surface to numerical portion, namely taken multiple measurements by same mode;

In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. the digital signal of selsyn module and an analog signal conversion accuracy method of testing, is characterized in that, described selsyn module comprises virtual instrument operating surface, angle to digital quantizer RDC and numeral to angle converter DRC; Virtual instrument operating surface is all connected with RDC, DRC;

Step one: the output arranging outside source is the reference signal that user requires, this reference signal is connected to selsyn RDC and DRC; Described reference signal comprises high-voltage signal RH and low-voltage signal RL;

Step 2: in the numeral of virtual instrument operating surface in the angle input frame of selsyn part, input angle value A to be converted, the angle value A according to input carries out following test:

If a. 0≤A < 60 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, probe ground connects the S3 output of DRC, by oscillographic passage 2 probe connect the S3 output of DRC, probe ground connects the S2 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and another connects the S3 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃,

By two of described digital voltmeter probes, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₃₂, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If b. 60 °≤A < 120 °, the probe of oscillographic passage 1 is connected the S3 output of DRC, probe ground connects the S2 output of DRC, the probe of oscillographic passage 2 is connected to the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S3 output of DRC, and another connects the S2 output of DRC, is then arranged by digital voltmeter and is operated in ac voltage measurement gear;

Then click angle and export button, make the analog quantity of selsyn DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₃₂;

By described digital voltmeter two probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

If C. 120 °≤A < 180 °, the probe of oscillographic passage 1 is connected the S1 output of DRC, probe ground connects the S3 output of DRC, the probe of oscillographic passage 2 is connected the S2 output of DRC, probe ground connects the S1 output of DRC, by two probes of 6.5 bit digital voltmeters, one of them connects the S1 output of DRC, and then digital voltmeter arranges and be operated in ac voltage measurement gear by another S3 output meeting DRC;

Then click angle and export button, make the analog quantity of DRC output angle angle value A; Read numerical value that described digital voltmeter measures and be recorded as U ₁₃,

By two of described digital voltmeter probes, one of them connects the S2 output of DRC, and another connects the S1 output of DRC, reads numerical value that described digital voltmeter measures and is recorded as U ₂₁, and read oscilloscope upper channel 1 and passage 2 waveform phase is homophase or anti-phase;

Step 3: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are homophases in step 2, the formulae discovery actual measurement output angle angle value θ according to below:

If 0≤θ < 60 °:

Then: U ₁₃/ U ₃₂=sin θ/sin (θ+120 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\frac{\sqrt{3}}{2}\frac{U_{13}}{U_{32}}}{1+\frac{U_{13}}{2U_{32}}}\right)$

If 60≤θ < 120 °:

Then: U ₃₂/ U ₂₁=sin (θ+120)/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}(U_{21}+U_{32})}{U_{21}-U_{32}}\right)$

If 120≤θ < 180 °:

Then: U ₁₃/ U ₂₁=sin θ/sin (θ+240 °)

That is: $\mathrm{\&theta;}=\mathrm{anc}\tan \left(\frac{\sqrt{3}{U}_{13}}{-U_{13}-2U_{21}}\right)$

Step 4: if the passage 1 of oscilloscope measurement and passage 2 waveform phase are anti-phase in step 2, then according to formulae discovery actual measurement output angle angle value θ below:

If 0≤θ < 60 °:

That is:

If 60≤θ < 120 °:

That is:

If 120≤θ < 180 °:

That is:

Step 5: calculate actual measurement output angle angle value θ, obtain numeral to selsyn conversion accuracy according to the difference of actual measurement output angle angle value θ and input angle angle value A;

Step 6: by the output S1 to S3 of DRC, correspondingly with RDC input S1 to S3 connects;

At the selsyn of virtual instrument operating surface to numerical portion, click angle measurement button, the analog quantity that DRC exports is converted to digital quantity by RDC, angle measurement B is demonstrated in the upper angle display box of virtual main interface, then described actual measurement output angle angle value θ is compared calculated difference with angle measurement B and obtain measure error, and then obtain the conversion accuracy of selsyn analog signal to digital signal.