CN102042803B - Precise arrangement of part separated electromagnetic angle sensor - Google Patents

Abstract

The invention relates to a method for precisely mounting a rotor and stator separated electromagnetic angle sensor, which mounts and adjusts according to a given process based on signal intensity and angular position coding number obtained after treatment of induced voltage signals of induction coils at different positions and an electric digital display meter matched therewith, and reaches the precise mounting. The method includes an adjustment step of interval and verticality between the rotor and the stator and an adjustment step of coaxiality of the rotor and the stator relative to a rotation axis. Though above method, the precisely mounting for a second time can be performed so as to ensure the use precision of the electromagnetic angle sensor measurement system, and facilities the product application and extension at the same time.

Description

The accurate installation method of isolation of components formula electromagnetic point sensor

Affiliated technical field:

The invention belongs to the electromagnetic point sensor technical field, be applied to the measurement of mechanical rotation angle.

Background technology:

At present; Utilize the angular transducer of electromagnetic principle manufacturing on various instrument and equipments, to have a wide range of applications; Inductosyn (INDUCTOSYN) is exactly typical case's representative of this base part; It comes across the 1950's, by U.S. a company (FARRAND) invention and production, nowadays remains one type of measurement component of major application meaning.Inductosyn has angular transducer and linear transducer.

The principle of work of electromagnetic point sensor is: through exciting circuit magnetizing coil (primary winding) is imported variable-current; Make inductive coil (secondary coil) export induced voltage; The shape of induced voltage depends on variation, coil shape and the magnetizing coil of exciting curent and the mutual alignment of inductive coil, can obtain the relative angle of magnetizing coil and inductive coil according to input and output signal.

The electromagnetic point sensor is made into two separated components respectively with magnetizing coil and inductive coil usually, referring to synoptic diagram 1.During use, be installed in respectively on body (stationary parts relatively) and the turning axle (relatively rotating parts), referring to synoptic diagram 2.To call the parts that are installed on the body in the following text is stator, and the parts that are installed on the turning axle are rotor.

Separate type electromagnetic point sensor has saved the alignment bearing of rotor and stator relative position with respect to integral sensor, has also just saved bearing mutual interference and some parts taked mutually on the bearing of eliminating sensor and the lathe.The error that exists various mechanical morpheme sum of errors electronic sections to bring in the high precision separate type angular transducer manufacture process in order to improve measuring accuracy, must be proofreaied and correct each semi-manufacture; Its process is: stator and rotor accurately are installed on the precision bearing system, detect systematic error, offset data is input in the electronic digital display table; Carry out error compensation, just can reach higher measuring accuracy, when the user uses; The technical difficulty of accurately installing once more is bigger; Alignment error directly influences the measuring accuracy of sensor, and the product of low precision can be installed according to the mechanical positioning face, and high-precision product then is difficult to accomplish.The field engineering difficulty has hindered the widespread use of this type high precision separate type angular transducer product greatly to a certain extent.

Summary of the invention:

In order to solve the problem that the user accurately installs voluntarily once more, electromagnetic point sensor and supporting with it electronic digital display table have been carried out innovative design.The relevant data that utilizes the electronic digital display table to show is adjusted according to given method, and the user can accomplish accurate installation, thereby guarantees the measuring accuracy of the angle measurement system that electromagnetic point sensing head and supporting with it electronic digital display table are formed.Additional specific function on the electronic digital display table; Promptly; Rotor and stator are reflected by the numeral that the electronic digital display table shows with respect to verticality, coaxiality error and rotor and the gap between the stator of turning axle; As the adjustment foundation of accurately installing, provide method of adjustment with this, make the user accomplish accurate installation voluntarily.

Rotor and the accurate installation method of stator separate type electromagnetic point sensor is characterized by:

The set-up procedure of gap and verticality between rotor and the stator:

Because signal amplifier non-linear and to the requirement of input signal, induced signal intensity will be adjusted in the scope of requirement.The maximum amplitude of signal can calculate through following formula:

$\mathrm{Ai}=\sqrt{D_S{i}^2+D_C{i}^2}$

i＝(1，2，3，4)

Wherein: D _SI and D _CI is respectively the induced voltage sampled data of i group inductive coil; Ai is the absolute value of maximum amplitude of the induced voltage of i group inductive coil;

Electronic digital display table by supporting demonstrates concrete data, as the adjustment foundation.Step is following:

1, S1 and two inductive coil output of C1 signal are inserted the electronic digital display table, calculate A1 and θ through the electronic digital display table, and show, micro-rotor, θ make when the θ value equals set-point along with changing, record A1.Preferably select to make D _SI and D _CThe θ value of the locus correspondence that the i absolute value equates is as specified value.

2, rotor Rotate 180 ° is referring to Fig. 9.S3 and two inductive coil output of C3 signal are inserted the electronic digital display table, and micro-rotor makes when the θ value equals set-point, record A3.Because the line of symmetry of definition inductive coil S1 and C1 is an X axis, so the difference of A1 and A3 reflects the error of perpendicularity Δ α that stator is installed.Adjustment stator installation site makes A1 and A3 equate.

3, S2 and two inductive coil output of C2 signal are inserted the electronic digital display table, micro-rotor makes when the θ value equals set-point, record A2.

4, rotor Rotate 180 ° inserts the electronic digital display table with S4 and two inductive coils output of C4 signal, and micro-rotor makes when θ value equals set-point, writes down A4.A2 and A4 difference have promptly reflected the error of perpendicularity Δ β that stator is installed.Adjustment stator installation site makes A2 and A4 equate.This moment, stator reached the requirement that can arrive installation accuracy with respect to the verticality of turning axle.

5, S1, C1, S3 and four inductive coil output of C3 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A1 that is calculated by S1 and C1 ₁With the maximum amplitude A3 that calculates by S3 and C3 ₁, A1 ₁With A3 ₁Difference reflect rotor with respect to the X of turning axle to the error of perpendicularity, for more accurate, can rotor Rotate 180 ° referring to Figure 10, be obtained A1 again ₂With A3 ₂, calculated difference:

$\mathrm{\ΔA}=\frac{{A1}_2+{A3}_1}{2}-\frac{{A1}_1+{A3}_2}{2}$

Δ A＞0, explain current location rotor upward axis to vergence direction be the forward of X coordinate axis, Δ A＜0, then vergence direction is the negative sense of X coordinate axis, adjusts to the scope that the mean value of Δ A=0 and A1 and A3 get into to allow.

6, S2, C2, S4 and four inductive coil output of C4 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A2 that is calculated by S2 and C2 ₁With the maximum amplitude A4 that calculates by S4 and C4 ₁,, obtain A2 again with rotor Rotate 180 ° ₂With A4 ₂, in like manner adjust Y to verticality with the 5th step.After the completion, rotor can reach the requirement of installation accuracy with respect to the verticality of turning axle.

Rotor and stator are with respect to the set-up procedure of rotating shaft coaxle degree:

Behind the thick dress of rotor and stator, all possibly there is a certain amount of coaxiality error, also need carries out accurate adjustment with respect to turning axle.Coaxiality error will cause being there are differences by the angle value that S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 calculate.Referring to Figure 11, during a certain rest position, there is the coaxiality error with respect to turning axle in stator; The stator central coordinate of circle is (X1; Y1), there is the coaxiality error with respect to turning axle in rotor, and the rotor central coordinate of circle is (X2; Y2), the rotor center of circle with respect to the stator center of circle exist X to Y to distance component be respectively: Δ X=X2-X1, Δ Y=Y2-Y1.Because Δ X and Δ Y absolute value are small-sized with respect to inductive coil; Its effect as: under the situation of no coaxiality error; Rotor has been rotated in a clockwise direction Δ θ 1 with respect to S1 and C1 inductive coil, and rotor has rotated Δ θ 1 with respect to S3 and C3 inductive coil along counter clockwise direction, and is same; Be rotated in a clockwise direction minute angle Δ θ 2 with respect to S2 and C2 inductive coil; Rotated minute angle Δ θ 2 with respect to S4 and C4 inductive coil along counter clockwise direction, according to the definition of coordinate system, relation below existing:

ΔY≈K1·Δθ1

ΔX≈K2·Δθ2

K1, K2 are scale-up factor.If the same angle value of θ 0 for being calculated by S1 and C1, S3 and two groups of signals of C3 under the no coaxiality error situation, θ 1, θ 3 are the current angle value that is calculated by S1 and C1, S3 and two groups of signals of C3 under the coaxiality error situation that exists, and should have:

$\mathrm{\θ}0=\frac{\mathrm{\θ}1+\mathrm{\θ}3}{2}$

$\mathrm{\&Delta;Y}\&ap;\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;(\mathrm{\&theta;}1-\frac{\mathrm{\&theta;}1+\mathrm{\&theta;}3}{2})=\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;\frac{\mathrm{\&theta;}1-\mathrm{\&theta;}3}{2}$

In like manner can get:

$\mathrm{\&Delta;X}\&ap;K2\&CenterDot;(\mathrm{\&theta;}2-\frac{\mathrm{\&theta;}2+\mathrm{\&theta;}4}{2})=K2\&CenterDot;\frac{\mathrm{\&theta;}2-\mathrm{\&theta;}4}{2}$

According to top said, the concrete steps that we have provided the right alignment adjustment are following:

1, in a certain rest position, like Figure 11, the electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 ₁, θ 2 ₁, θ 3 ₁, θ 4 ₁

2, with rotor Rotate 180 °, shown in figure 12.This moment the rotor central coordinate of circle be (X3, Y3).The electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 again ₂, θ 2 ₂, θ 3 ₂, θ 4 ₂

3, obtain two system of equations:

$\left\{\begin{array}{c}Y2-\mathrm{<figure-callout\; id="1"\; label="Y"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">Y</figure-callout>}1=K1\&CenterDot;\frac{{\mathrm{\&theta;}1}_1-{\mathrm{\&theta;}3}_1}{2}\\ Y3-\mathrm{<figure-callout\; id="1"\; label="Y"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">Y</figure-callout>}1=K1\&CenterDot;\frac{{\mathrm{\&theta;}1}_2-{\mathrm{\&theta;}3}_2}{2}\\ Y3=-Y2\end{array}\right.$

$\left\{\begin{array}{c}X2-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">X</figure-callout>}1=K2\&CenterDot;\frac{{\mathrm{\&theta;}2}_1-{\mathrm{\&theta;}4}_1}{2}\\ X3-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">X</figure-callout>}1=K2\&CenterDot;\frac{{\mathrm{\&theta;}2}_2-{\mathrm{\&theta;}4}_2}{2}\\ \mathrm{<figure-callout\; id="3"\; label="X"\; filenames="HSB00000703502400022.png"\; state="\{\{state\}\}">X</figure-callout>}3=-X2\end{array}\right.$

Solve (X1, Y1), (X3, Y3), the center of circle skew that rotor and stator caused because of the coaxiality error with respect to turning axle when these two groups of numerical value were position shown in Figure 12.The position of adjustment rotor and stator is repeated first and second again and is gone on foot, and less than setting value, has so far promptly accomplished the adjustment with respect to the rotating shaft coaxle degree of rotor and stator up to rotor and stator center of circle side-play amount.

The resolving power of high-precision electronic digital display meter generally can accomplish ten thousand/once, and is perhaps higher.With respect to the excircle dimension of sensing head, its arc length is about 0.3 micron, is higher than the resolving power of clock gauge, so adopt above method, installation accuracy is higher than the method that adopts mechanical positioning, thereby, the service precision of assurance angle measuring system.

Beneficial effect:

The invention has the beneficial effects as follows the method for the accurate installation that a kind of rotor with practical value and stator separate type electromagnetic point sensor are provided and the innovative design of corresponding electromagnetic point sensor; Make the user utilize this angle measurement system; The step that provides to specifications; Can accomplish the accurate installation of high precision electromagnetic point sensor, be beneficial to the popularization that this series products is used.

Description of drawings:

Fig. 1 is rotor and stator synoptic diagram.

Fig. 2 is rotor and stator scheme of installation.

Fig. 3 is the rotor winding synoptic diagram of the son of giving an example.

Fig. 4 is the stator coil synoptic diagram of the son of giving an example.

Fig. 5 is exciting curent and induced voltage curve map.

Fig. 6 is the function curve diagram of the sampled data of induced voltage after analog to digital conversion with respect to space angle.

Fig. 7 is the coordinate synoptic diagram.

Fig. 8 is rotor and stator error in mounting position synoptic diagram.

There is the vertical error synoptic diagram in Fig. 9 for the relative revolving shaft with stator of rotor.Wherein, (b) figure is the error synoptic diagram behind (a) figure rotor Rotate 180 °, and the inductive coil of two groups of symmetries and distance H 1, the H2 of magnetizing coil change on the stator.

There is not vertical error in Figure 10 for stator, has only the relative revolving shaft of rotor to have the vertical error synoptic diagram.Wherein (b) figure is the error synoptic diagram behind (a) figure rotor Rotate 180 °, and the inductive coil of two groups of symmetries and distance H 1, the H2 of magnetizing coil change on the stator.

Figure 11 is that rotor and stator exist the eccentric synoptic diagram that causes because of coaxiality error with respect to turning axle.

Figure 12 is the eccentric synoptic diagram behind the rotor Rotate 180 shown in Figure 11 °, and the rotor central coordinate of circle is by (X2 becomes Y2) that (X3, Y3), the position of inductive coil and magnetizing coil also changes.

Embodiment:

Shown in accompanying drawing 1-12.In order to obtain a realistic plan, do whole consideration and design to this angle measuring system, utilize its characteristics, the acquisition of implementation space relative position information and concrete locus adjustment vector.

Separate type electromagnetic point sensor is made up of electromagnetic sensing head and electronic circuit two parts.Sensing head is divided into stator and the rotor with coil; Consider signal transmission rationality, generally on rotor, be shaped on magnetizing coil (winding continuously), on stator, be shaped on inductive coil (segmentation winding); The top is the rotor synoptic diagram among Fig. 1, and following is the stator synoptic diagram.Electronics partly is divided into to magnetizing coil to be provided the exciting circuit of exciting curent and the voltage signal of inductive coil output is converted into the coding circuit of dimensional orientation data.Coil on the electromagnetic point sensing head of high resolution distribution period θ on circumference _TBe generally 1 ° or 0.5 °, do not influence the statement of principle, Fig. 3 and Fig. 4 have provided θ _TEqual 7.5 ° coil synoptic diagram.Exciting curent is from I1 and two port inputs of I2, referring to Fig. 3.Induced voltage is by the output of the inductive coil two ends of segmentation, and the design's segments must not be less than 8, with 8 be example, referring to Fig. 4.During work, Us2 links to each other with Us3, and Us4 links to each other with Us5, and Us6 links to each other with Us7; Export a road feel by Us1 and Us8 and answer voltage, Uc2 links to each other with Uc3, and Uc4 links to each other with Uc5; Uc6 links to each other with Uc7, answers voltage by another road feel of Uc1 and Uc8 output, and this two paths of signals is supplied with electronics use of partly encoding.Then do not link to each other when mounted, each inductive coil is exported a road feel and is answered voltage signal.The excitation mode that multiple electric current change curve is arranged is example with the exciting curent intensity curve for being interrupted serrate, and the voltage of induction output is for being interrupted square wave, and is as shown in Figure 5.SF is identical with magnet excitation frequency, and inductive coil is at moment t _iSample; Obtain data after the analog to digital conversion, this value data is relevant with the relative position of magnetizing coil and inductive coil, ignores the higher hamonic wave of trace; This value data is a sine function with respect to rotational angle theta, and the coil S1 on the stator, S2, S3, S4 differ 2N θ successively on circumference _TThe position, angle, coil C1, C2, C3, C4 differ 2N θ successively on circumference _TThe position, angle, and these two groups of coil starting points differ N θ _T+ 0.25 θ _TThe position, angle, in the ideal case, with respect to rotational angle theta; The curve of each section coil output voltage sampled data is identical in first group, and the curve of each section coil output voltage sampled data is identical in second group, and; Two groups of output voltage sampled data curves differ four/one-period; As shown in Figure 6, in 360 °, be periodic function, be designated as:

$D_{S}i=\mathrm{Ai}\&CenterDot;\mathrm{SIN}(2\mathrm{\&pi;}\&times;\frac{\mathrm{\&theta;}}{{\mathrm{\&theta;}}_T})$

$D_{C}i=\mathrm{Ai}\&CenterDot;\mathrm{COS}(2\mathrm{\&pi;}\&times;\frac{\mathrm{\&theta;}}{{\mathrm{\&theta;}}_T})$

(i＝1，2，3，4)

Width in appointment is θ _TThe space angle interval in, can be by D _SI and D _CThe ratio of i calculates the θ value, also can obtain the absolute value Ai of maximum amplitude.

There is under the alignment error situation D _SI, D _CI and Ai can change with respect to exact value, and the voltage sample data that the inductive coil in each group is corresponding produce difference, according to D _SI, D _CThe numerical value of i and Ai can obtain the information of alignment error, takes this as a foundation and carries out the installation site adjustment.

At first, selected lathe turning axle is the Z axle of coordinate system, and definition inductive coil S1 is an X axis with the line of symmetry of C1, and the intersection point of stator coil face and turning axle is an initial point, and it is as shown in Figure 7 to define angle variable α, β, θ.Rotor or stator error in mounting position Δ α, Δ β, Δ X, Δ Y are as shown in Figure 8, and the gap H between rotor and the stator as shown in Figure 2.Can utilize instruments such as clock gauge and slide calliper rule slightly to adorn earlier, so above-mentioned alignment error is less relatively, each item function of electronic section can have been worked, and just installation accuracy is accurate inadequately, and measurement of angle does not reach due precision.

Shape and mutual alignment by magnetizing coil and inductive coil can be known: the gap Hj between each inductive coil on epitrochanterian magnetizing coil and the stator mainly influences the absolute value Ai of induced voltage maximum amplitude; Phase effect for sampling curve is less, thereby less to the magnetizing coil and the inductive coil relative angle position values affect that calculate.Stator and rotor are with respect to the error of perpendicularity Δ α k of turning axle, the different variations that Δ β k can cause Hj.During work, every group of interior induced voltage wanted to export after the addition, and every group of interior induced voltage intensity shakiness will influence average effect, thereby influences the angle calculation accuracy.Stator and rotor will cause eccentric Δ Xk and Δ Yk with respect to the coaxiality error of turning axle; Thereby cause each inductive coil sampling curve generation phase shift; Directly influence the accuracy of the relative angle position numerical value that calculates, little to the absolute value Ai influence of induced voltage maximum amplitude.During work, the phase shift of a certain amount of sampling curve though the induced signal of axle center symmetry is cancelled out each other can reduce the measuring accuracy of sensor.In a word, the gap between the error of perpendicularity, rotor and the stator and will adjust in the scope of permission with axis error could guarantee the measuring accuracy of sensor.

In sum, behind the thick dress, the small error of perpendicularity and coaxiality error are different to the main influence of the corresponding sampling curve of each inductive coil, therefore, can carry out the adjustment respectively of relatively independent ground to verticality and right alignment.Do concrete introduction below.

The set-up procedure of gap and verticality between rotor and the stator:

Because signal amplifier non-linear and to the requirement of input signal, induced signal intensity will be adjusted in the scope of requirement.The maximum amplitude of signal can calculate through following formula:

$\mathrm{Ai}=\sqrt{D_S{i}^2+D_C{i}^2}$

i＝(1，2，3，4)

Wherein: D _SI and D _CI is respectively the induced voltage sampled data of i group coil; Ai is the absolute value of maximum amplitude of the induced voltage of i group coil:

Electronic digital display table by supporting demonstrates concrete data, as the adjustment foundation.Step is following:

1, S1 and two inductive coil output of C1 signal are inserted the electronic digital display table, calculate A1 and θ through the electronic digital display table, and show, micro-rotor, θ make when the θ value equals set-point along with changing, record A1.Preferably select to make D _SI and D _CThe θ value of the locus correspondence that the i absolute value equates is as specified value.

2, rotor Rotate 180 ° is referring to Fig. 9.S3 and two inductive coil output of C3 signal are inserted the electronic digital display table, and micro-rotor makes when the θ value equals set-point, record A3.Because the line of symmetry of definition inductive coil S1 and C1 is an X axis, so the difference of A1 and A3 reflects the error of perpendicularity Δ α that stator is installed.Adjustment stator installation site makes A1 and A3 equate.

3, S2 and two inductive coil output of C2 signal are inserted the electronic digital display table, micro-rotor makes when the θ value equals set-point, record A2.

4, rotor Rotate 180 ° inserts the electronic digital display table with S4 and two inductive coils output of C4 signal, and micro-rotor makes when θ value equals set-point, writes down A4.A2 and A4 difference have promptly reflected the error of perpendicularity Δ β that stator is installed.Adjustment stator installation site makes A2 and A4 equate.This moment, stator reached the requirement that can arrive installation accuracy with respect to the verticality of turning axle.

5, S1, C1, S3 and four inductive coil output of C3 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A1 that is calculated by S1 and C1 ₁With the maximum amplitude A3 that calculates by S3 and C3 ₁, A1 ₁With A3 ₁Difference reflect rotor with respect to the X of turning axle to the error of perpendicularity, for more accurate, can rotor Rotate 180 ° referring to Figure 10, be obtained A1 again ₂With A3 ₂, calculated difference:

$\mathrm{\&Delta;A}=\frac{{A1}_2+{A3}_1}{2}-\frac{{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">A</figure-callout>}1}_1+{A3}_2}{2}$

Δ A＞0, explain current location rotor upward axis to vergence direction be the forward of X coordinate axis, Δ A＜0, then vergence direction is the negative sense of X coordinate axis, adjusts to the scope that the mean value of Δ A=0 and A1 and A3 get into to allow.

6, S2, C2, S4 and four inductive coil output of C4 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A2 that is calculated by S2 and C2 ₁With the maximum amplitude A4 that calculates by S4 and C4 ₁,, obtain A2 again with rotor Rotate 180 ° ₂With A4 ₂, in like manner adjust Y to verticality with the 5th step.After the completion, rotor can reach the requirement of installation accuracy with respect to the verticality of turning axle.

Rotor and stator are with respect to the set-up procedure of rotating shaft coaxle degree:

Behind the thick dress of rotor and stator, all possibly there is a certain amount of coaxiality error, also need carries out accurate adjustment with respect to turning axle.Coaxiality error will cause being there are differences by the angle value that S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 calculate.Referring to Figure 11, during a certain rest position, there is the coaxiality error with respect to turning axle in stator; The stator central coordinate of circle is (X1; Y1), there is the coaxiality error with respect to turning axle in rotor, and the rotor central coordinate of circle is (X2; Y2), the rotor center of circle with respect to the stator center of circle exist X to Y to distance component be respectively: Δ X=X2-X1, Δ Y=Y2-Y1.Because Δ X and Δ Y absolute value are very little with respect to coil dimension; Its effect as: under the situation of no coaxiality error; Rotor has been rotated in a clockwise direction Δ θ 1 with respect to S1 and C1 inductive coil, and rotor has rotated Δ θ 1 with respect to S3 and C3 inductive coil along counter clockwise direction, and is same; Be rotated in a clockwise direction minute angle Δ θ 2 with respect to S2 and C2 inductive coil; Rotated minute angle Δ θ 2 with respect to S4 and C4 inductive coil along counter clockwise direction, according to the definition of coordinate system, relation below existing:

ΔY≈K1·Δθ1

ΔX≈K2·Δθ2

K1, K2 are scale-up factor.If the same angle value of θ 0 for being calculated by S1 and C1, S3 and two groups of signals of C3 under the no coaxiality error situation, θ 1, θ 3 are the current angle value that is calculated by S1 and C1, S3 and two groups of signals of C3 under the coaxiality error situation that exists, and should have:

$\mathrm{\&theta;}0=\frac{\mathrm{\&theta;}1+\mathrm{\&theta;}3}{2}$

$\mathrm{\&Delta;Y}\&ap;\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;(\mathrm{\&theta;}1-\frac{\mathrm{\&theta;}1+\mathrm{\&theta;}3}{2})=\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;\frac{\mathrm{\&theta;}1-\mathrm{\&theta;}3}{2}$

In like manner can get:

$\mathrm{\&Delta;X}\&ap;K2\&CenterDot;(\mathrm{\&theta;}2-\frac{\mathrm{\&theta;}2+\mathrm{\&theta;}4}{2})=K2\&CenterDot;\frac{\mathrm{\&theta;}2-\mathrm{\&theta;}4}{2}$

According to top said, the concrete steps that we have provided the right alignment adjustment are following:

1, in a certain rest position, like Figure 11, the electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 ₁, θ 2 ₁, θ 3 ₁, θ 4 ₁

2, with rotor Rotate 180 °, shown in figure 12.This moment the rotor central coordinate of circle be (X3, Y3).The electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of signals of C4 again ₂, θ 2 ₂, θ 3 ₂, θ 4 ₂

3, obtain two system of equations;

$\left\{\begin{array}{c}Y2-\mathrm{<figure-callout\; id="1"\; label="Y"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">Y</figure-callout>}1=\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;\frac{{\mathrm{\&theta;}1}_1-{\mathrm{\&theta;}3}_1}{2}\\ Y3-\mathrm{<figure-callout\; id="1"\; label="Y"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">Y</figure-callout>}1=\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">K</figure-callout>}1\&CenterDot;\frac{{\mathrm{\&theta;}1}_2-{\mathrm{\&theta;}3}_2}{2}\\ \mathrm{<figure-callout\; id="3"\; label="Y"\; filenames="HSB00000703502400022.png"\; state="\{\{state\}\}">Y</figure-callout>}3=-Y2\end{array}\right.$

$\left\{\begin{array}{c}X2-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">X</figure-callout>}1=K2\&CenterDot;\frac{{\mathrm{\&theta;}2}_1-{\mathrm{\&theta;}4}_1}{2}\\ X3-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="HSB00000703502400021.png,HSB00000703502400022.png"\; state="\{\{state\}\}">X</figure-callout>}1=K2\&CenterDot;\frac{{\mathrm{\&theta;}2}_2-{\mathrm{\&theta;}4}_2}{2}\\ X3=-X2\end{array}\right.$

Solve (X1, Y1), (X3, Y3), the center of circle skew that rotor and stator caused because of the coaxiality error with respect to turning axle when these two groups of numerical value were position shown in Figure 12.The position of adjustment rotor and stator is repeated first and second again and is gone on foot, and less than setting value, has so far promptly accomplished the adjustment with respect to the rotating shaft coaxle degree of rotor and stator up to rotor and stator center of circle side-play amount.

The resolving power of high-precision electronic digital display meter generally can accomplish ten thousand/once, and is perhaps higher.With respect to the excircle dimension of sensing head, its arc length is about 0.3 micron, is higher than the resolving power of clock gauge, so adopt above method, installation accuracy is higher than the method that adopts mechanical positioning, thereby, the service precision of assurance angle measuring system.

Claims (1)

1. rotor and the accurate installation method of stator separate type electromagnetic point sensor; The position encoded numerical value of signal intensity and angle that this method obtains after supporting with it electronic digital display list processing (LISP) according to the induced voltage signal of the inductive coil of diverse location; Process according to given is installed adjustment, reaches accurate installation; This method comprises set-up procedure, rotor and the stator in gap and verticality between rotor and the stator set-up procedure with respect to the rotating shaft coaxle degree, it is characterized by:

The set-up procedure of gap and verticality between rotor and the stator:

Because signal amplifier non-linear and to the requirement of input signal, induced signal intensity will be adjusted in the scope of requirement; The maximum amplitude of signal can calculate through following formula:

$\mathrm{Ai}=\sqrt{D_S{i}^2+D_C{i}^2}$

i＝(1，2，3，4)

Wherein: D _SI and D _CI is respectively the induced voltage sampled data of i group inductive coil; Ai is the absolute value of maximum amplitude of the induced voltage of i group inductive coil;

And the electronic digital display table by supporting demonstrates concrete data, as the adjustment foundation; Step is following:

One, S1 and two inductive coil output of C1 signal are inserted the electronic digital display table, calculate A1 and θ through the electronic digital display table, and show, micro-rotor, θ make when the θ value equals set-point along with changing, record A1; Selection makes D _SI and D _CThe θ value of the locus correspondence that the i absolute value equates is as specified value;

Two, rotor Rotate 180 ° inserts the electronic digital display table with S3 and two inductive coils output of C3 signal, and micro-rotor makes when θ value equals set-point, writes down A3; Because the line of symmetry of definition inductive coil S1 and C1 is an X axis, so the difference of A1 and A3 reflects the error of perpendicularity Δ α that stator is installed; Adjustment stator installation site makes A1 and A3 equate;

Three, S2 and two inductive coil output of C2 signal are inserted the electronic digital display table, micro-rotor makes when the θ value equals set-point, record A2;

Four, rotor Rotate 180 ° inserts the electronic digital display table with S4 and two inductive coils output of C4 signal, and micro-rotor makes when θ value equals set-point, writes down A4; A2 and A4 difference have promptly reflected the error of perpendicularity Δ β that stator is installed; Adjustment stator installation site makes A2 and A4 equate;

Five, S1, C1, S3 and four inductive coil output of C3 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A1 that is calculated by S1 and C1 ₁With the maximum amplitude A3 that calculates by S3 and C3 ₁, A1 ₁With A3 ₁Difference reflect rotor with respect to the X of turning axle to the error of perpendicularity, for more accurate, can rotor Rotate 180 ° be obtained A1 again ₂With A3 ₂, calculated difference:

$\mathrm{\&Delta;A}=\frac{{A1}_2+{A3}_1}{2}-\frac{{A1}_1+{A3}_2}{2}$

Δ A＞0, explain current location rotor upward axis to vergence direction be the forward of X coordinate axis, Δ A＜0, then vergence direction is the negative sense of X coordinate axis, adjusts to the scope that the mean value of Δ A=0 and A1 and A3 get into to allow;

Six, S2, C2, S4 and four inductive coil output of C4 signal are inserted the electronic digital display table, the electronic digital display table will show the maximum amplitude A2 that is calculated by S2 and C2 ₁With the maximum amplitude A4 that calculates by S4 and C4 inductive coil ₁,, obtain A2 again with rotor Rotate 180 ° ₂With A4 ₂, in like manner adjust Y to verticality with the 5th step;

Rotor and stator are following with respect to the set-up procedure of rotating shaft coaxle degree:

One, in a certain rest position, the stator central coordinate of circle be (X1, Y1); The rotor central coordinate of circle be (X2, Y2); The electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of inductive coil output of C4 signal ₁, θ 2 ₁, θ 3 ₁, θ 4 ₁

Two, with rotor Rotate 180 °, this moment the rotor central coordinate of circle be (X3, Y3); The electronic digital display table calculates four angle value θ 1 by S1 and C1, S2 and C2, S3 and C3, S4 and four groups of inductive coil output of C4 signal again ₂, θ 2 ₂, θ 3 ₂, θ 4 ₂Obtain two system of equations:

$\left\{\begin{array}{c}Y2-Y1=K1\&CenterDot;\frac{{\mathrm{\&theta;}1}_1-{\mathrm{\&theta;}3}_1}{2}\\ Y3-Y1=K1\&CenterDot;\frac{{\mathrm{\&theta;}1}_2-{\mathrm{\&theta;}3}_2}{2}\\ Y3=-Y2\end{array}\right.$

$\left\{\begin{array}{c}X2-X1=K1\&CenterDot;\frac{{\mathrm{\&theta;}2}_1-{\mathrm{\&theta;}4}_1}{2}\\ X3-X1=K1\&CenterDot;\frac{{\mathrm{\&theta;}2}_2-{\mathrm{\&theta;}4}_2}{2}\\ X3=-X2\end{array}\right.$

Solve (X1, Y1), (X3, Y3), these two groups of numerical value are the center of circle skew that rotor and stator cause because of the coaxiality error with respect to turning axle; The position of adjustment rotor and stator is repeated first and second again and is gone on foot, and less than setting value, has so far promptly accomplished the adjustment with respect to the rotating shaft coaxle degree of rotor and stator up to rotor and stator center of circle side-play amount.

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