CN209687938U - A kind of displacement correction device and magnetic levitation bearing system - Google Patents
A kind of displacement correction device and magnetic levitation bearing system Download PDFInfo
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- CN209687938U CN209687938U CN201920252927.2U CN201920252927U CN209687938U CN 209687938 U CN209687938 U CN 209687938U CN 201920252927 U CN201920252927 U CN 201920252927U CN 209687938 U CN209687938 U CN 209687938U
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 120
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Abstract
The utility model discloses a kind of displacement correction device and magnetic levitation bearing system, which includes: reference circuit and correcting circuit；Wherein, the reference circuit, for providing reference signal；Nonlinear displacement signal to be corrected is carried out logarithm operation, the linear displacement signal after being corrected for being based on the reference signal by the correcting circuit.The displacement signal of the embodiment of the utility model, the position detection signal and axis that can solve current vortex sensor output is not linear relationship and leads to the problem of detection accuracy difference, achievees the effect that promotion detection accuracy.
Description
Technical field
The utility model belongs to magnetic levitation technology field, and in particular to a kind of displacement correction device and magnetic suspension bearing system
System more particularly to a kind of eddy current displacement sensor linearity circuit and the magnetic suspension shaft with the linearity circuit
Hold system.
Background technique
In magnetic levitation bearing system, the stable suspersion of Yao Shixian axis needs accurate position sensor real-time detection axis
Position.According to the needs of magnetic suspension system, there is higher requirement to the linearity, the resolution ratio of position sensor.Common biography
Sensor is eddy current displacement sensor.
Current vortex sensor high resolution, but linearity measuring range is insufficient.In magnetic levitation bearing system, the axial position of axis is detected
Need biggish transducer range.When meeting range and needing, the position signal output of current vortex sensor is in apparent non-thread
Property；The signal and displacement signal of namely sensor output are not linear relationships, this results in the position inaccuracy of detection, in turn
Lead to unstable, the suspension low precision that suspends, even results in axis collision, damage magnetic suspension system.
Above content is only used for auxiliary and understands the technical solution of the utility model, does not represent and recognizes that above content is existing
Technology.
Utility model content
The purpose of this utility model is that in view of the foregoing drawbacks, a kind of displacement correction device and magnetic suspension bearing system are provided
System is not linear relationship with the displacement signal of the position detection signal and axis that solve current vortex sensor output and causes detection quasi-
The problem of true property difference achievees the effect that promote detection accuracy.
The utility model provides a kind of displacement correction device, comprising: reference circuit and correcting circuit；Wherein, the benchmark
Circuit, for providing reference signal；The correcting circuit, for being based on the reference signal, by nonlinear displacement to be corrected
Signal carries out logarithm operation, the linear displacement signal after being corrected.
Optionally, further includes: controller；The controller, for determining whether the linear displacement signal meets setting
Threshold value；If the linear displacement signal is unsatisfactory for the given threshold, output regulation signal to the reference circuit；The base
Quasi- circuit, for the reference signal being adjusted based on the adjustment signal, with the reference signal after being adjusted.
Optionally, further includes: analog-digital converter；The analog-digital converter, for the linear displacement signal to be carried out mould
After number conversion, then export to the controller.
Optionally, the reference circuit, comprising: adjust resistance, the first current-limiting resistance and comparator；Wherein, the adjusting
Input terminal of the adjustable side of resistance as adjustment signal, and the non-inverting input terminal for adjusting resistance and being connected to the comparator；
First current-limiting resistance is also connected to the non-inverting input terminal of the comparator, and the inverting input terminal of the comparator is connected to institute
The output end of comparator is stated, and the output end of the comparator is connected to the reference signal input of the correcting circuit.
Optionally, the correcting circuit, comprising: the second current-limiting resistance, third current-limiting resistance and logarithmic operational circuit；Its
In, second current-limiting resistance is connected to the reference signal output end of the reference circuit and the base of the logarithmic operational circuit
Between calibration signal input terminal；Second current-limiting resistance, be connected to nonlinear displacement signal output end to be corrected with it is described right
Between the signal input part to be corrected of number computing circuit.
Optionally, the logarithmic operational circuit, comprising: operational amplifier and triode；The operational amplifier and described
Triode is built to form logarithmic circuit；Alternatively, the logarithmic operational circuit, using logarithm operation chip.
Optionally, nonlinear displacement signal to be corrected, comprising: the magnetic suspension bearing detected by current vortex sensor
Axial displacement；Wherein, in the matched situation for carrying out the reference signal to the current vortex sensor: to be corrected is non-
Linear displacement signal, comprising: the minimum value of the axial displacement of the current vortex sensor output；At the beginning of the reference signal
Initial value, comprising: the minimum reference signal of setting.
Match with above-mentioned apparatus, the utility model another further aspect provides a kind of magnetic levitation bearing system, comprising: the above institute
The displacement correction device stated.
The embodiment of the utility model can effectively be passed current vortex by eddy current displacement sensor linearity circuit
The nonlinear displacement signal correction of sensor output is linear signal, can promote the accuracy to bearing displacement detecting.
Further, the embodiment of the utility model is exported by utilizing logarithmic operational circuit according to collected logarithmic circuit
Voltage adjust automatically reference voltage makes correcting circuit be applicable in different sensor output, without changing hardware circuit, effectively increases
Circuit applicability, can also promote maglev stability and reliability.
Further, the embodiment of the utility model is passed through by the nonlinear properties for exporting existing current vortex sensor
Circuit calibration based on logarithm operation is linear signal；Different lines is matched by software control adjust automatically reference voltage simultaneously
Property correction output require, output signal range is adjustable, applied widely, and high reliablity.
The embodiment of the utility model as a result, is line by the nonlinear displacement signal correction for exporting current vortex sensor
Property signal, the displacement signal of the position detection signal and axis that solve current vortex sensor output is not linear relationship and causes to detect
The problem of accuracy difference, thus, overcome that position detection accuracy in the prior art is poor, influence suspension stability and accuracy lacks
It falls into, realizes that position detection accuracy is good, is able to ascend the beneficial effect of suspension stability and accuracy.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an embodiment of the displacement correction device of the utility model；
Fig. 2 is the axial sensor detection schematic diagram of an embodiment of the magnetic levitation bearing system of the utility model；
Fig. 3 is that the current vortex sensor signal correction effect of an embodiment of the magnetic levitation bearing system of the utility model is bent
Line chart；
Fig. 4 is the displacement correction circuit diagram of an embodiment of the magnetic levitation bearing system of the utility model；
The sensor matching flow diagram of one embodiment of the magnetic levitation bearing system that Fig. 5 is；
Fig. 6 is the flow diagram of an embodiment of the displacement correction method of the utility model；
Fig. 7 is the flow diagram that an embodiment of reference signal is matched in the method for the utility model.
In conjunction with attached drawing, appended drawing reference is as follows in the utility model embodiment:
10- axis；20- current vortex sensor.
Specific embodiment
It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
It is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
Embodiment according to the present utility model provides a kind of displacement correction device.The utility model shown in Figure 1
The structural schematic diagram of one embodiment of device.The displacement correction device may include: reference circuit and correcting circuit.
Specifically, the reference circuit may be used to provide reference signal, and the reference signal exported to correction electricity
The first input end on road.
Such as: as shown in figure 4, being additionally arranged adjustable reference circuit, for adjusting reference signal, rectification circuit can be automatically to ginseng
It examines signal to be adjusted, to be suitable for the correction of different sensors (each sensor has differences certainly).
In an optional example, the reference circuit may include: to adjust resistance, the first current-limiting resistance and comparator.
As shown in figure 4, adjustable reference circuit, may include: the devices such as resistance and amplifier, for exporting adjustable reference voltage signal.
Specifically, input terminal of the adjustable side for adjusting resistance as adjustment signal, and the adjusting resistance is connected to
The non-inverting input terminal of the comparator.Such as: the adjustable side for adjusting resistance is connected to the adjustment signal output end of controller, adjusts
First connecting pin of resistance is grounded, and the second connection end for adjusting resistance is connected to the non-inverting input terminal of comparator.
Specifically, first current-limiting resistance is also connected to the non-inverting input terminal of the comparator, the comparator it is anti-
Phase input terminal is connected to the output end of the comparator, and the output end of the comparator is connected to the benchmark of the correcting circuit
Signal input part.
As a result, by adjusting resistance, the first current-limiting resistance and comparator, reference circuit is formed, structure is simple, and benchmark is believed
Number adjustable, using flexible is good.
Specifically, the correcting circuit can be used for based on the reference signal, by nonlinear displacement signal to be corrected
Carry out logarithm operation, the linear displacement signal after being corrected.
Such as: eddy current displacement sensor linearity circuit, it can be effectively by the non-linear of current vortex sensor output
Displacement signal is corrected to linear signal.
Such as: it can use logarithmic operational circuit and its feature, adjusted automatically according to collected logarithmic circuit output voltage
Whole reference voltage makes correcting circuit be applicable in different sensor output, without changing hardware circuit, effectively increases circuit and is applicable in
Property.
Such as: the nonlinear properties that existing current vortex sensor is exported pass through the circuit calibration based on logarithm operation
For linear signal.The signal relation of logarithmic operational circuit before and after the processing is logarithmic relationship, i.e. y=log (x/a), y are circuit output
Signal, x are circuit input signal, and a is benchmark reference signal.
Reference signal is provided by reference circuit as a result, and then being based on the reference signal by correcting circuit will be to be corrected
Nonlinear displacement signal carry out logarithm operation after, the linear displacement signal after correct, realization to nonlinear displacement signal
Linearity correction, structure is simple, and correct accuracy is good, high reliablity.
In an optional example, the correcting circuit may include: the second current-limiting resistance, third current-limiting resistance and right
Number computing circuit.
Specifically, second current-limiting resistance is connected to the reference signal output end and the logarithm of the reference circuit
Between the reference signal input of computing circuit.
Specifically, second current-limiting resistance is connected to nonlinear displacement signal output end and the logarithm to be corrected
Between the signal input part to be corrected of computing circuit.
Such as: it is similar to exponential function using the curve characteristic of sensor nonlinear signal, which is subjected to logarithm fortune
It calculates, and then realizes linear transformation.Logarithmic operational circuit (or integrated logarithmic operational circuit) generally comprises two input current signals
I1, I2, I1 are reference signal, and I2 is nonlinear properties to be corrected.Input/output relation are as follows: Uo=Alog (I2/I1),
Middle A is fixed constant.Circuit has certain limitation to the current signal size of input.Therefore must to input signal I1, I2 into
Row processing, matching are just able to achieve the correction of signal.Wherein, input signal I1, I2 handled, match and is just able to achieve signal
Correction, comprising: according to Ohm's law I=U/R, the size of I1 fits through Uref and resistance R1 to adjust, the size of I2 according to
Ui chooses R2 to adjust.
Such as: since input is current signal, the characteristics of according to logarithmic operational circuit (or integrated circuit), can also pass through
String resistance or other conversion regimes, convert voltages into current signal.Logarithmic operational circuit, string resistance mode, other conversion sides
The effect of formula is all that voltage signal is converted to current signal.Wherein, the foundation of string resistance mode is the defeated of logarithmic operational circuit
Entering is also operational amplifier, and the characteristics of according to " empty short " of operational amplifier, " void is disconnected ", string resistance can convert voltages into electric current
Signal.Such as: string resistance mode may include: to input after voltage signal string resistance since resistance end connects operational amplifier,
Amplifier reverse side ground connection, according to " empty short empty disconnected ", therefore voltage signal just corresponds to current signal i=U/R.
Correcting circuit, structure letter are formed by the second current-limiting resistance, third current-limiting resistance and logarithmic operational circuit as a result,
Single and reliable, safety.
Optionally, the logarithmic operational circuit, may include: operational amplifier and triode, the operational amplifier and
The triode is built to form logarithmic circuit；Alternatively, the logarithmic operational circuit, using logarithm operation chip.
Such as: as shown in figure 4, the circuit that logarithmic operational circuit can be integrated circuit or voluntarily build, to signal into
Row logarithmic function operation.Wherein, logarithmic operational circuit can be using the circuit or integrated electricity that can carry out logarithm process to signal
Road.Such as: the logarithm operation chip of the logarithmic circuit or chip producer built using operational amplifier and triode is such as
ADL5303 chip.
Logarithm operation is realized by the logarithmic operational circuit of diversified forms as a result, the flexibility of logarithm operation can be promoted
And convenience.
Optionally, nonlinear displacement signal to be corrected may include: by current vortex sensor (electric whirlpool as shown in Figure 2
Flow sensor 20) the obtained axial displacement of magnetic suspension bearing (axis 10 as shown in Figure 2) of detection.
Such as: eddy current displacement sensor linearity circuit is utilized, is linear signal by sensor output calibration, improves
Linearity measuring range, improves position signal detection accuracy；Circuit can meet the correction needs of different sensors range, avoid more
Change hardware circuit.As shown in figure 4, the nonlinear properties Ui of current vortex sensor is input to correcting circuit, final output Uo is line
Property signal solid line as shown in Figure 3.In this way, increasing the linearity measuring range of magnetic levitation bearing system current vortex sensor, improve
The reliability of system, circuit applicability are wide.
It is corrected as a result, by the nonlinear displacement signal detected to current vortex sensor, magnetic suspension may be implemented
To the accurate detection of bearing displacement in bearing arrangement, and then promote suspension reliability and accuracy.
Wherein, in the matched situation for carrying out the reference signal to the current vortex sensor: to be corrected is non-thread
Property displacement signal, may include: the minimum value of the axial displacement of current vortex sensor output.The reference signal
Initial value may include: the minimum reference signal of setting.
Such as: different linearity correction output is matched by software control adjust automatically reference voltage and is required, output signal
Range is adjustable.
The minimum value for the axial displacement that current vortex sensor is exported by the minimum reference signal based on setting as a result, into
Row preliminary corrections realize the matching to the reference signal of current vortex sensor, reliable and safety.
It can also include: controller in an optional embodiment.
Specifically, the controller can be set between the correcting circuit and the reference circuit, can be used for really
Whether the fixed linear displacement signal meets given threshold.If the linear displacement signal is unsatisfactory for the given threshold, defeated
Adjustment signal is to the reference circuit out.During specifically used, the controller can be also used for determining the linear position
Whether shifting signal meets in the operation of given threshold, if the linear displacement meets the given threshold, completes to be corrected
Nonlinear displacement signal measurement main body such as current vortex sensor matching setting.
Specifically, the reference circuit can be used for that the reference signal is adjusted based on the adjustment signal, with
Reference signal after being adjusted.In turn, the correcting circuit can be used for again based on the reference signal after the adjusting
Nonlinear displacement signal to be corrected carries out logarithm operation, with the linear displacement signal after being corrected again.
Such as: the nonlinear properties of current vortex sensor output are believed by the circuit calibration based on logarithm operation to be linear
Number；It matches different linearity correction output by software control adjust automatically reference voltage simultaneously to require, output signal range can
It adjusts, circuit can meet the correction needs of different sensors range, avoid change hardware circuit, increase circuit applicability.
As a result, by controlling in the case where determining that the linear displacement signal of correcting circuit output is unsatisfactory for given threshold
Reference circuit adjusts reference signal, and then is carried out again based on the reference signal after adjusting to nonlinear displacement signal to be corrected
Correction is conducive to promote matched accuracy and reliability to realize to the matching of the reference signal of current vortex sensor.
It can also include: analog-digital converter in an optional embodiment.
Specifically, the analog-digital converter can be set between the correcting circuit and the controller, can be used for
It after the linear displacement signal is carried out analog-to-digital conversion, then exports to the controller, so that the controller is determined through modulus
Whether the linear displacement signal after conversion meets given threshold.
Such as: as shown in figure 4, ADC is analog-digital converter, acquire final output signal U o.
As a result, by determination is linear after analog-to-digital conversion again after the linear displacement signal progress analog-to-digital conversion after correction
Whether displacement signal meets given threshold, can promote the accuracy and convenience of judgement.
The linear school of eddy current displacement sensor is passed through using the technical solution of the utility model through a large amount of verification experimental verification
The nonlinear displacement signal correction of current vortex sensor output can be effectively linear signal, can be promoted to axis by positive circuit
Hold the accuracy of displacement detecting.
Embodiment according to the present utility model additionally provides a kind of magnetic suspension bearing system corresponding to displacement correction device
System.The magnetic levitation bearing system may include: above-described displacement correction device.
In an optional embodiment, the embodiment of the utility model provides a kind of linear school of eddy current displacement sensor
Positive circuit can be applied to the magnetic levitation bearing system of variable speed centrifugal chiller plants.
Optionally, in the embodiment of the utility model, eddy current displacement sensor linearity circuit can be effectively by electric whirlpool
The nonlinear displacement signal correction of flow sensor output is linear signal.
Specifically, logarithmic operational circuit and its feature be can use, it is automatic according to collected logarithmic circuit output voltage
Reference voltage is adjusted, so that correcting circuit is applicable in different sensor output and it is suitable to effectively increase circuit without changing hardware circuit
The property used.
Wherein, the signal relation of logarithmic operational circuit before and after the processing is logarithmic relationship, i.e. y=log (x/a), y are that circuit is defeated
Signal out, x are circuit input signal, and a is benchmark reference signal.The input/output relation of signal be in logarithmic curve, the curve with
Sensor signal attenuation curve is similar.
In an optional example, the embodiment of the utility model, the non-linear letter that existing current vortex sensor is exported
Number, it is linear signal by the circuit calibration based on logarithm operation；It is matched simultaneously by software control adjust automatically reference voltage
Different linearity corrections, which exports, to be required, and output signal range is adjustable.
That is, the embodiment of the utility model, proposes a kind of linearity circuit of current vortex sensor, by current vortex
The nonlinear properties of sensor output are linear signal by the circuit calibration based on logarithm operation；Simultaneously certainly by software control
Dynamic adjustment reference voltage matches different linearity correction output and requires, and output signal range is adjustable, and circuit can meet different sensings
The correction of tolerance journey needs, and avoids change hardware circuit, increases circuit applicability.
As it can be seen that sensor is exported school using eddy current displacement sensor linearity circuit by the embodiment of the utility model
Just it is linear signal, improves linearity measuring range, improve position signal detection accuracy；Circuit can meet different sensors range
Correction need, avoid change hardware circuit.In this way, the linearity measuring range of magnetic levitation bearing system current vortex sensor is increased,
The reliability of system is improved, circuit applicability is wide.
In an optional specific embodiment, example shown in Fig. 2 to Fig. 5 may refer to, to the side of the utility model
The specific implementation process of case illustrates.In magnetic levitation bearing system, the axial movement of axis is as shown in Fig. 2, axial direction
Moveable distance is n, i.e. n is the mobile distance of axis, therefore least effective dose (LED) journey needed for current vortex sensor is n.Electric whirlpool
The precision of flow sensor is higher, but linearity measuring range is smaller.For the detecting distance n of magnetic levitation bearing system, sensor output letter
Number change rate be obviously reduced with the increase of distance.As shown in figure 3, dotted line represents the output signal of current vortex sensor, i.e., it is empty
Line indicates the current vortex sensor output signal before correction, and solid line indicates the current vortex sensor output signal after correction.
In an optional specific example, the correcting circuit of the utility model can be as shown in Figure 4.In Fig. 4, the correction
Circuit may include: adjustable reference circuit, logarithmic operational circuit, MCU acquisition and control section.Current vortex sensor it is non-thread
Property signal Ui be input to correcting circuit, final output Uo is linear signal solid line as shown in Figure 3.
For correcting circuit shown in Fig. 4, current vortex sensor is believed using logarithmic operational circuit currently without technology
It number is corrected.In addition to logarithmic circuit, the embodiment of the utility model is additionally arranged adjustable reference circuit, for adjusting reference signal,
Rectification circuit reference signal can be adjusted automatically, thus be suitable for different sensors correction (each sensor is deposited certainly
In difference).
Optionally, in Fig. 4, adjustable reference circuit may include: the devices such as resistance and amplifier, for exporting adjustable ginseng
Examine voltage signal.
Optionally, in Fig. 4, the circuit that logarithmic operational circuit can be integrated circuit or voluntarily build carries out signal
Logarithmic function operation.Wherein, logarithmic operational circuit can be using the circuit or integrated circuit that can carry out logarithm process to signal.
Such as: the logarithm operation chip such as ADL5303 of the logarithmic circuit or chip producer built using operational amplifier and triode
Chip.
Optionally, in Fig. 4, ADC is analog-digital converter, acquires final output signal U o；MCU is Master control chip.
In an optional specific example, the embodiment of the utility model utilizes the curve characteristic of sensor nonlinear signal
Similar to exponential function, which is subjected to logarithm operation, and then realize linear transformation.Logarithmic operational circuit (or integrated logarithm
Computing circuit) two input current signals I1, I2 are generally comprised, I1 is reference signal, and I2 is nonlinear properties to be corrected.It is defeated
Enter output relation are as follows: Uo=Alog(I2/I1), wherein A is fixed constant.Circuit has centainly the current signal size of input
Limitation.Therefore input signal I1, I2 must be handled, match the correction for being just able to achieve signal.
Wherein, input signal I1, I2 handled, match the correction for being just able to achieve signal, comprising: according to Ohm's law
The size of I=U/R, I1 fit through Uref and resistance R1 to adjust, and the size of I2 chooses R2 according to Ui to adjust.
Optionally, since input is current signal, the characteristics of according to logarithmic operational circuit (or integrated circuit), can also lead to
String resistance or other conversion regimes are crossed, current signal is converted voltages into.
Specifically, the effect of logarithmic operational circuit, string resistance mode, other conversion regimes is all to convert voltage signal
For current signal.Wherein, it is also operational amplifier that the foundation of string resistance mode, which is the input of logarithmic operational circuit, is put according to operation
The characteristics of " void is short " of big device, " empty disconnected ", string resistance can convert voltages into current signal.
Such as: string resistance mode, after may include: voltage signal string resistance, since resistance end connects operational amplifier
Input, amplifier reverse side ground connection, according to " empty short empty disconnected ", therefore voltage signal just corresponds to current signal i=U/R.
Such as: other conversion regimes such as dedicated convert chip, or the special function circuit built.
Therefore, the embodiment of the utility model, can be by taking voltage signal as an example, input/output relation are as follows:For specific eddy current displacement sensor, the range of output signal U i is it has been determined that i.e. I2
Range determines.In order to which signal realizes best correction and reasonable Uo output area, this just needs to match suitable Uref.Such as it wants
Making the output of Uo minimum is then to need the value of adjustment Uref to make the minimum value of I1 ≈ I2 near 0, then it is about Alog1 that Uo, which exports minimum value,
=0.
More than, have been realized in the correction and output signal range adjustment of sensor nonlinear signal.But for difference
Bearing arrangement, sensor axis is also different to the different and different current vortex sensor output voltage range of detecting distance, then
Range of signal to be corrected is just different.For the range of signal Uo after guarantee linearity correction effect and correction, it is necessary to according to difference
Signal Matching to be corrected adjust Uref.The sampling that the utility model design increases Uo thus is read and Uref software control portion
Point.For flow chart as shown in figure 5, first making sensor signal Ui minimum value, MCU control gives initial Uref value (such as 1V),
Then MCU acquires the value for reading Uo by ADC signal, judges whether Uo output meets needs, if not satisfied, then as needed
Uo output area controls adjustable reference the regulation of electrical circuit Uref, until obtaining desired Uo, is carried out automatically to realize using software
Sensor matching avoids change hardware circuit, improves the applicability of correcting circuit.
In an alternative specific example, in the embodiment of the utility model, reference circuit is preferably adjustable reference circuit,
It can be existing any type of controllable outputting reference circuit, reference circuit output can be voltage signal or current signal.
Such as: it is with electric resistance partial pressure, for the circuit that amplifier follows in the embodiment of the utility model.Other forms can
Control output circuit such as programmable signal pio chip, DAC converter, adjustable resistance voltage regulator circuit etc..
In an alternative specific example, in the embodiment of the utility model, the signal to be corrected of linearity circuit is not
It is limited to voltage signal, is equally applicable to current signal；The conversion of voltage signal can be existing any type of voltage-to-current
Conversion circuit.
Such as: other conversion regimes such as specialized voltages-current signal conversion chip, or the special function circuit built.
The processing and function realized by the magnetic levitation bearing system of the present embodiment essentially correspond to aforementioned shown in FIG. 1
Embodiment, principle and the example of device, therefore not detailed place in the description of the present embodiment, may refer to the phase in previous embodiment
It speaks on somebody's behalf bright, this will not be repeated here.
Through a large amount of verification experimental verification, using the technical solution of the utility model, by utilizing logarithmic operational circuit, according to adopting
The logarithmic circuit output voltage adjust automatically reference voltage collected makes correcting circuit be applicable in different sensor output, without more
Change hardware circuit, effectively increase circuit applicability, maglev stability and reliability can also be promoted.
Embodiment according to the present utility model additionally provides a kind of magnetic suspension bearing system corresponding to magnetic levitation bearing system
The displacement correction method of system, the flow diagram of an embodiment of the method for the utility model as shown in Figure 6.The magnetic suspension bearing
The displacement correction method of system may include: step S110 and step S120.
At step S110, reference signal is provided, and the reference signal is exported to the first input end of correcting circuit.
Such as: as shown in figure 4, being additionally arranged adjustable reference circuit, for adjusting reference signal, rectification circuit can be automatically to ginseng
It examines signal to be adjusted, to be suitable for the correction of different sensors (each sensor has differences certainly).
At step S120, it is based on the reference signal, nonlinear displacement signal to be corrected is subjected to logarithm operation, is obtained
Linear displacement signal after to correction.
Such as: eddy current displacement sensor linearity circuit, it can be effectively by the non-linear of current vortex sensor output
Displacement signal is corrected to linear signal.
Such as: it can use logarithmic operational circuit and its feature, adjusted automatically according to collected logarithmic circuit output voltage
Whole reference voltage makes correcting circuit be applicable in different sensor output, without changing hardware circuit, effectively increases circuit and is applicable in
Property.
Such as: the nonlinear properties that existing current vortex sensor is exported pass through the circuit calibration based on logarithm operation
For linear signal.The signal relation of logarithmic operational circuit before and after the processing is logarithmic relationship, i.e. y=log (x/a), y are circuit output
Signal, x are circuit input signal, and a is benchmark reference signal.
Reference signal is provided by reference circuit as a result, and then being based on the reference signal by correcting circuit will be to be corrected
Nonlinear displacement signal carry out logarithm operation after, the linear displacement signal after correct, realization to nonlinear displacement signal
Linearity correction, structure is simple, and correct accuracy is good, high reliablity.
Optionally, nonlinear displacement signal to be corrected may include: by current vortex sensor (electric whirlpool as shown in Figure 2
Flow sensor 20) the obtained axial displacement of magnetic suspension bearing (axis 10 as shown in Figure 2) of detection.
Such as: eddy current displacement sensor linearity circuit is utilized, is linear signal by sensor output calibration, improves
Linearity measuring range, improves position signal detection accuracy；Circuit can meet the correction needs of different sensors range, avoid more
Change hardware circuit.As shown in figure 4, the nonlinear properties Ui of current vortex sensor is input to correcting circuit, final output Uo is line
Property signal solid line as shown in Figure 3.In this way, increasing the linearity measuring range of magnetic levitation bearing system current vortex sensor, improve
The reliability of system, circuit applicability are wide.
It is corrected as a result, by the nonlinear displacement signal detected to current vortex sensor, magnetic suspension may be implemented
To the accurate detection of bearing displacement in bearing arrangement, and then promote suspension reliability and accuracy.
Wherein, in the matched situation for carrying out the reference signal to the current vortex sensor: to be corrected is non-thread
Property displacement signal, may include: the minimum value of the axial displacement of current vortex sensor output.The reference signal
Initial value may include: the minimum reference signal of setting.
Such as: different linearity correction output is matched by software control adjust automatically reference voltage and is required, output signal
Range is adjustable.
The minimum value for the axial displacement that current vortex sensor is exported by the minimum reference signal based on setting as a result, into
Row preliminary corrections realize the matching to the reference signal of current vortex sensor, reliable and safety.
It can also include: the process for matching reference signal in an optional embodiment.
Below with reference in the method for the utility model shown in Fig. 7 match reference signal an embodiment flow diagram, into
One step illustrates the detailed process for matching reference signal, may include: step S210 and step S220.
Step S210, determines whether the linear displacement signal meets given threshold.If the linear displacement signal is discontented
The foot given threshold, then output regulation signal to the reference circuit.During specifically used, the controller can be with
For in determining the operation whether linear displacement signal meets given threshold, if the linear displacement meets the setting
Threshold value is then completed the matching to the measurement main body such as current vortex sensor of nonlinear displacement signal to be corrected and is arranged.
Step S220 is adjusted the reference signal based on the adjustment signal, is believed with the benchmark after being adjusted
Number.In turn, the correcting circuit can be used for based on the reference signal after the adjusting, again by nonlinear displacement to be corrected
Signal carries out logarithm operation, with the linear displacement signal after being corrected again.
Such as: the nonlinear properties of current vortex sensor output are believed by the circuit calibration based on logarithm operation to be linear
Number；It matches different linearity correction output by software control adjust automatically reference voltage simultaneously to require, output signal range can
It adjusts, circuit can meet the correction needs of different sensors range, avoid change hardware circuit, increase circuit applicability.
As a result, by controlling in the case where determining that the linear displacement signal of correcting circuit output is unsatisfactory for given threshold
Reference circuit adjusts reference signal, and then is carried out again based on the reference signal after adjusting to nonlinear displacement signal to be corrected
Correction is conducive to promote matched accuracy and reliability to realize to the matching of the reference signal of current vortex sensor.
In an optional embodiment, can also include: after the linear displacement signal is carried out analog-to-digital conversion, then it is defeated
Out to the controller, so that the controller determines whether the linear displacement signal after analog-to-digital conversion meets given threshold.
Such as: as shown in figure 4, ADC is analog-digital converter, acquire final output signal U o.
As a result, by determination is linear after analog-to-digital conversion again after the linear displacement signal progress analog-to-digital conversion after correction
Whether displacement signal meets given threshold, can promote the accuracy and convenience of judgement.
The processing and function realized by the method for the present embodiment essentially correspond to aforementioned magnetcisuspension shown in Fig. 2 to Fig. 5
Embodiment, principle and the example of floating bearing arrangement, therefore not detailed place in the description of the present embodiment, may refer to previous embodiment
In related description, this will not be repeated here.
Through a large amount of verification experimental verification, using the technical solution of the present embodiment, by the way that existing current vortex sensor is exported
Nonlinear properties, by the circuit calibration based on logarithm operation be linear signal；Pass through software control adjust automatically base simultaneously
The different linearity correction of quasi- voltage matches, which exports, to be required, and output signal range is adjustable, applied widely, and high reliablity.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only the embodiments of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of the claims of the utility model.
Claims (8)
1. a kind of displacement correction device characterized by comprising reference circuit and correcting circuit；Wherein,
The reference circuit, for providing reference signal；
Nonlinear displacement signal to be corrected is carried out logarithm operation, obtained by the correcting circuit for being based on the reference signal
Linear displacement signal after to correction.
2. displacement correction device according to claim 1, which is characterized in that further include: controller；
The controller, for determining whether the linear displacement signal meets given threshold；If the linear displacement signal is not
Meet the given threshold, then output regulation signal to the reference circuit；
The reference circuit, for the reference signal being adjusted based on the adjustment signal, with the base after being adjusted
Calibration signal.
3. displacement correction device according to claim 2, which is characterized in that further include: analog-digital converter；
The analog-digital converter after the linear displacement signal is carried out analog-to-digital conversion, then is exported to the controller.
4. displacement correction device described in one of -3 according to claim 1, which is characterized in that the reference circuit, comprising: adjust
Resistance, the first current-limiting resistance and comparator；Wherein,
Input terminal of the adjustable side for adjusting resistance as adjustment signal, and the adjusting resistance is connected to the comparator
Non-inverting input terminal；
First current-limiting resistance is also connected to the non-inverting input terminal of the comparator, the inverting input terminal connection of the comparator
The extremely output end of the comparator, and the output end of the comparator is connected to the reference signal input of the correcting circuit.
5. displacement correction device described in one of -3 according to claim 1, which is characterized in that the correcting circuit, comprising: second
Current-limiting resistance, third current-limiting resistance and logarithmic operational circuit；Wherein,
Second current-limiting resistance is connected to the reference signal output end of the reference circuit and the base of the logarithmic operational circuit
Between calibration signal input terminal；
Second current-limiting resistance, be connected to nonlinear displacement signal output end to be corrected and the logarithmic operational circuit to
Between correction signal input terminal.
6. displacement correction device according to claim 5, which is characterized in that the logarithmic operational circuit, comprising: operation is put
Big device and triode；The operational amplifier and the triode are built to form logarithmic circuit；
Alternatively,
The logarithmic operational circuit, using logarithm operation chip.
7. displacement correction device described in one of -3 according to claim 1, which is characterized in that nonlinear displacement letter to be corrected
Number, comprising: by the axial displacement for the magnetic suspension bearing that current vortex sensor detects；
Wherein,
In the matched situation for carrying out the reference signal to the current vortex sensor:
Nonlinear displacement signal to be corrected, comprising: the minimum value of the axial displacement of the current vortex sensor output；
The initial value of the reference signal, comprising: the minimum reference signal of setting.
8. a kind of magnetic levitation bearing system characterized by comprising displacement correction device as claimed in claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252927.2U CN209687938U (en) | 2019-02-27 | 2019-02-27 | A kind of displacement correction device and magnetic levitation bearing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920252927.2U CN209687938U (en) | 2019-02-27 | 2019-02-27 | A kind of displacement correction device and magnetic levitation bearing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654125A (en) * | 2019-02-27 | 2019-04-19 | 珠海格力电器股份有限公司 | A kind of displacement correction device, magnetic levitation bearing system and its displacement correction method |
-
2019
- 2019-02-27 CN CN201920252927.2U patent/CN209687938U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654125A (en) * | 2019-02-27 | 2019-04-19 | 珠海格力电器股份有限公司 | A kind of displacement correction device, magnetic levitation bearing system and its displacement correction method |
| CN109654125B (en) * | 2019-02-27 | 2024-02-06 | 珠海格力电器股份有限公司 | Displacement correction device, magnetic suspension bearing system and displacement correction method thereof |
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