DE1804623A1 - Static numeric coding device - Google Patents

Abstract

1,248,742. Position encoders. PRECILEC. 24 Oct., 1968 [24 Oct., 1967; 6 Sept., 1968], No. 50481/68. Heading G4H. A transducer measuring the relative position of two members to give an amplitude-significant signal and an analogue-digital converter digitizing the amplitude signal are fed with the same source as the reference signal. In the embodiment of Fig. 1 signals u 1 = E sin # . sin wt, u 2 = F cos # . sin wt, u 3 = - E sin # . sin wt and u 4 = - E cos # . sin wt representing the angular displacement # of the primary winding of resolver 10 are first compared with zero to determine which two signals are positive. The associated two comparators are then enabled to compare their two inputs with a stepped reference signal derived from voltage divider 6, each step being counted in an auxiliary counter 7 until one of the two comparators is operated. The logic circuit 5 then sets a counter 9 to a level dependent on which two comparators were initially enabled and which comparator operated first and counter 7 is counted down to 0, counter 9 being simultaneously incremented or decremented from its set level under the control of the logic circuit. The count is stored in a register 14 and may be displayed. The voltage divider (Fig. 3, not shown) comprises a parallel resistor chain the resistances being switched under the control of transistor switches operated by the outputs of counter 7. In the embodiment of Fig. 7 the signal from a potentiometer 18 representing the angular or linear position of its slider 17 are compared with four stepped reference voltages representing four possible ranges of the input. Initially the reference voltages have the values 0, v/4, v/2, 3v/4 to determine the range in which the input lies. The reference voltages are then stepped and as in the embodiment of Fig. 1 pulses simultaneously counted in auxiliary counter 7. The counter 9 is preset by the logic circuitry 5 in dependance on the range in which the input is found to be. The apparatus of Fig. 1 may be modified to include coarse and fine transducers, the coarse transducer giving twice the required resolution, i.e. an auxiliary digit 0 or 1 and the fine transducer dividing one coarse digit into a hundred increments. A logic circuit adds one to the coarse value if the auxiliary digit is " 1 " and the fine value is between 0 and 25 and subtracts 1 if the auxiliary coarse value is " 0 " and the fine value is between 75 and 99. Alternatively a three-stage system, i.e. coarse, fine and medium may be used.

Description

P 2087

Precilec, Paris / France
Static numeric coding device

The present invention relates to a coding device, which, based on an analog electrical signal defining a position, provides numerical information supplies. The position defined in this way can be an angular position or a linear distance.

According to the invention, the coding device is characterized in that that it has in combination a position sensor and a static analog-numeric converter, which immediately analyzes the amplitude of the signals supplied by the transducer and numerical information supplies which corresponds to the position indicated by the transducer.

The term pick-up should be understood to mean any devices which supply alternating signals whose amplitudes are periodic Functions of the analyzed parameter are.

The position sensor is, for example, an electrical one Voltage pick-up, such as a potentiometer, which accordingly its mechanical form allows to show rotations or translations or an electromagnetic pickup a translation, e.g. a differential transformer.

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! - 2 - 1804621

In the case of recording or displaying an angular position, this sensor belongs to the family of those under the name Synchronous transmitters or position indicators known devices that supply several voltages that: -periodic, represent trigonometric functions of the analyzed parameter, i.e. the angle to be coded.

The analog-numerical converter has a sub-device that supplies a sequence τοη voltages, the amplitude of which is proportional

»The reference voltage is also a comparator for the voltages of the transducer to compare with this voltage sequence, there is still a logical selection circle that follows the preceding Selection of two comparators ensures what is necessary for the process sequence if the comparator is identified the state has changed, furthermore the control of a numerical counter by which the numerical information is supplied to a memory according to the position indicated by the transducer.

In the event that a very fine resolution of the displayed P angle is desired, it is proposed according to the invention to provide an arrangement with at least two degrees of fineness. The input information is due to mechanical reductions in relation to the display of the angular position thus the angular positions of arms, e.g. a main arm driving at least one secondary arm, the secondary arm executes a certain number of revolutions in one revolution of the main arm.

A transducer for the angular position and an analog-numeric converter are provided for each arm. In this case there is a logical one between the recorders!

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see to remove any ambiguity that may exist, which can result from the fact that there is an error in the position of the transducer, or that the analog signals are not linear.

For a better understanding of the invention, it is described below explained in more detail on the basis of the figures: They represent:

FIG. 1 shows a simplified symbolic circuit diagram of an exemplary embodiment of a static numeric coding device according to the invention, in which the transducer is formed by a rotary member; the mentioned periodic In this case, functions are sine functions,

FIG. 2 is a table showing the amplitude as a function of the The angle θ of the various voltages which the rotor supplies according to FIG. 1 is shown, namely with strong lines the selected stresses and the information corresponding to these stresses,

FIG. 3 shows a simplified electrical circuit diagram of an exemplary embodiment for the voltage divider in Figure 1,

Figures 4, 5 and 6 three typical schemes for the numerical display, which is provided by the coding device according to the invention and which accommodates an ambiguity shows with an existing mechanical reduction in two arms,

Figure 7 is a simplified Sehaltschema for an embodiment a static coding device according to the invention at which the one indicating a longitudinal displacement

Sensor consists of a potentiometer and 9098 2 2/0917

FIG. 8 is a table showing the amplitude as a function of the position χ of the slide of the potentiometer in FIG. 7 shows the voltage supplied and the constants for the case that four comparators are used.

Figures 1 - β relate to the special case of the display an angular position, Figures 7 and 8 in the case of the display of a length adjustment.

.Der Figure 1 it can be seen that a primary coil 10 of the circulator the transducer for an angular position forms, which forms an angle θ with a reference direction. The device according to the invention is intended to measure this angle and in numerical form indicate. A reference angle 11, either on the primary Fitting or on an identical magnetic circle as that of the runner, but on fixed fittings, one delivers sinusoidal voltage, which gives an exact picture of the electromotive force according to amplitude and phase, which is on the secondary side is induced by the rotor. This reference voltage, is fed to a voltage divider 6 which is connected to an auxiliary counter 7, which is a sequence of voltages supplies which are proportional in terms of their amplitude to the reference voltage and of the same frequency.

The secondary side of the transducer for the angular position is formed by two coils 12 and 13 which are at right angles to each other and with their center on ground. These coils deliver four voltages of typej

U-j_ = E sin 9 sin- ^ t U ₂ = E cos θ sinwt

U, = -E sin θ sin-ct U. = -E cos θ sin- ^ t

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E is the induced electromotive force, θ der angle to be coded and ^ 'the alternating frequency of the primary Supply voltage. The reference voltage supplied by the coil 11 has the form:

v = V sin-: vt,
where V is as equal to the voltage E as possible.

Each of the four voltages IL · to IL · is provided to a comparator 1-4 supplied so that they can be compared with the various voltages generated by the divider. The result this comparison is taken up by a logical selection circle, which consequently the later work of the auxiliary counter 7, the control device 8 and the counter 9 programmed. The content of the latter is immediately transferred to the memory 14 or the numerical result is available, e.g. for visual display or for further processing.

A clock 15 and a time base 16 associated with the reference frequency are fed, ensure the logical order of the various operations by issuing instructions: a. to the logical selection circle 5, b. to the auxiliary counter 7, c. to the auxiliary counter 7, the control device 8, the counter and the memory 14.-

The picture in Figure 2 shows the variations as a function of the Angle Θ, the amplitudes of the four voltages supplied by the rotor. These amplitudes have the form:

Ui = E sin θ with ui = Ui sin ^ t.

The first line of the figure is in Roman numerals the number of the quadrant (Q7 and in the second line the number of the semiquandrant (1/2 Q) in which aich the angle θ is located. With the considered execution

809822/09 17

-S-

SAD ORIGINAL

For example, only the positive voltages of the essentially linear part of the curves shown are recorded. the The third line shows the voltage u obtained, which corresponds to the angle of the solid lines. the fourth line represents the value of the constant c introducing the numerator as a function of the half-quadrant in which the angle to be coded is.

The operation of the device is as follows, it being assumed that in the embodiment described the feed frequency is 400 Hz *. The rotor supplies four voltages u-, to u. In phase or in antiphase with the reference voltage v, the amplitude of which for a given Angle θ is indicated in Figure 2. At any moment two of the voltages u are positive and the other two are negative.

The coding the angular position is performed at least once in the course of these voltages u and indeed for a time-successive running process which comprises the three operations mentioned below ι

a. Identification of the quadrant

b. Quantification of the amplitude

c. synthesis

These three operations are carried out in sequence, e.g. in the course of the positive half-wave of the reference voltage, within a period of about 0.3 ms,. fairly accurate around the moment when the reference voltage reaches its peak value.

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The time base 16 controls the successive triggering of these operations, which the connections a, b, c, in Figure 1 correspond.

a. Determination of the quadrant

The quadrant in which the position of the angle θ is located is determined by simply reading the polarity of the two voltages supplied by the circulator.

The output of the voltage divider 6 has the voltage zero in the time interval a, the comparators 1 and 2 give, for example directly the polarities of the voltages u- and Up. The reading of the polarities is done without ambiguity, because at the point in time where it is done, the voltages are on the one hand to more than $ 90 on their peak value and on the other hand only one of the two voltages changes its sign at the boundary of the second quadrant. The logical selection circle registers the indication of the quadrant and consequently selects the two comparators, which are those with the reference voltage two in phase, positive voltages in the time interval a obtain. If, for example, the angle θ is in the second quadrant, the comparators 1 and 4 are selected (Figure 2). This selection is made simply by the fact that the other two comparators are inhibited in their function. This selection of the comparators, i.e. the voltages u, corresponds to a change in the variable, which instead of θ a Sets angle Θ 'between 0 and 90 ° and which differs from θ by a known amount of 90, 180 or 270 °, depending on whether the angle θ is in the second, third or fourth quadrant.

In the following phase of the operation, the two are selected Stresses are designated with u-, 'and U ^'.

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b. Quantification of the amplitude

The aim of this operation is to measure the numerical value of the new variable Θ ¹ , which is determined by the two voltages: U-, ¹ = E sin Θ 'sincf t; Up ¹ = E cos Θ ¹ sin ^ t

is defined.

An angle unit ε is used for this measurement, which is from depends on the desired resolution N. ε = 360 ° / ϊί-

With a resolution of N = 360 points for a The unit of rotation is 1 °.

The voltage divider 6 generates ν to transmit the reference voltage a step-shaped signal in which each step has an amplitude defined as follows: j

V sin η £ · sin. a / t,

where η is the increasing sequence of the complete values given by the auxiliary counter 7 is supplied, assumes. The counting frequency of the auxiliary counter is, for example, 200 K Hz and η can assume the values between 0 and 45, because whichever is the value of θ, it necessarily has a tension u-, 'or Ug't which has its peak value between 0 and E / Γ2.

The range of the quantification of the amplitude is thus limited to this interval; the corresponding part of the curves is shown in solid lines in FIG.

In the practical case, the incrementing of the counter takes place until one of the two comparators used changes its state and the amplitude of the voltage generated by the voltage divider 6 _{exceeds one of the two voltages u-, 'and u 2} '.

-9-909822 / 09 17th

strides.

The change in state of one of the comparators is called by the logical selection circuit sending a hold signal for • the auxiliary counter 7, which is blocked at the value k, according to following relationship:

(k - 1) £ </ θ'οάβρ (90ί- θ ')] <£ k £

Defines the identity of the comparator which is flipped the half-quadrant in which you see θ is the corresponding one Information is retained by the logical selection circle.

c. synthesis

At the moment when the time base 16 triggers phase c, the logic selection circuit gives the numerical value of the constant C, which is the in the course of the previous identification phase identified half-quadrant, to the counter 9 Further. This numerical value is given in FIG. 2 on the last line.

Shortly thereafter, the content of the auxiliary counter 7 is fed to the counter 9 in the following way: The auxiliary counter, starting from UuIl, counts step by step, in which it forwards the corresponding pulses to the control circuit 8 of the counter 9. This receives information about the identity of the half-quadrant from the logical selection circle. This information determines the Counting direction of the counter 9. The counter 9 is an up / down counter of the classic type, which can be combined with any suitable Code works. Its mode of action is as follows:

If the determined half-quadrant is odd, the counter counts 9, starting from the constant value C, all the necessary pulses are to set the auxiliary counter 6 to zero. The end result is then: c + k.

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If the determined half-quadrant is even, the counter subtracts 9 (k - 1) pulses and the end result is: C - (k - 1).

Based on the command of the time base, the content of the counter $ is fed to the output or the numerical information remains available until the next cycle.

The memory 14 is any type of electrical memory, the information of which is made visible or, for example, incorporated into a computer can be.

The accuracy of the conversion that took place, i.e. the transmission the angular position in numerical information depends on a number of factors, of which the following are mentioned be: The similarity of the signals of the transducer, the validity of the approximation of the reference voltage and the induced electromotive Power and accuracy of working of the voltage divider 6.

The proposed according to the invention device results in a satisfactory solution under two conditions: The winding is provided as the secondary winding of a magnetic circuit identical to the transducer, but on a fixed armature and in located in the same area. The feed current of the coil 10 flows through the primary circuit of this magnetic circuit. on this way the reference voltage is as close to the same as possible electromotive force, which is on the secondary side of the transducer is induced and it varies in the same way as it does in the case of a variation in the amplitude or frequency of the supply voltage or varies according to the conditions of the environment. This means that with a close approximation the following applies: V = E.

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In an arrangement according to FIG. 7, in which a linear displacement is assumed, the indicated electrical signal is used by interposing the slide 17 of a potentiometer 18 to feed it to a comparator 1, 2, 3, 4. The reference voltage, which is taken from the clamping of the potentiometer 18, is fed to the voltage divider 6, which supplies a sequence of voltages vpn, the amplitude of which is proportional to the reference voltage. In the illustrated B _e ispiel the reference voltage is divided into four portions and each of the four comparators receives a sequence vpm voltages whose zero level is shifted by a quarter relative to the value of the reference voltage, according to the known principle of the staggered functions.

In every comparator this voltage sequence is tracked down with the one Signal of the transducer compared as in the case of an angle adjustment. The processes of transformation are analogous, but with the proviso that certain special conditions which are adapted to the linear nature of the displacement of the slide are changed. So the length of the potentiometer is divided into sections instead of quadrants or angular ranges in the case of an angular adjustment, and the slide effects a linear instead of an angular adjustment.

The feed frequency is, for example, 400 Hz. The mode of operation of the device is as follows: The transducer delivers a voltage u, the amplitude of which is a linear function of the mechanical setting. The coding of the situation takes place once through the period of the voltage u, according to the process sequences defined in the previous case, three of them Operations run one after the other in the course of the positive half-wave of the reference voltage, in "a time interval,

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the middle of which coincides almost exactly with the point in time in which the reference voltage reaches its peak value »

The time base 16 controls the order in which these operations are triggered, these being linked to connections a, b, c in FIG correspond.

a. Determination of the section.

The section in which the slider is located is identified by the simultaneous position of the comparators, the can only take one tax from two states. The correspondingly assigned comparator is selected for this quietly.

In the exemplary embodiment shown, the comparison voltages for this operation have the following values V ₁ = 0, Y ₂ = v / 4, v ₃ << v / 2, v ₄ = 5, v / 4.

The comparator 2 is thus selected. (Point a)

b. The quantification of the amplitude

The aim of this operation is to find the numerical value of the Measure the voltage u reached level, which is supplied by the transducer within the selected section. For for this measurement one chooses an increasing value, which depends on the desired resolution, or a number N of analysis points the maximum run of the slide. The voltage divider generates the reference voltage, in the example shown, at the four analysis sections and four comparators are used, four level signals, the increase being the height of the levels Are defined. The zero level of each of the signals is from the

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previous distinguished by a quarter of the reference voltage. The. The incremental frequency of the level, e.g. 200 K Hz, controls the incrementation of the auxiliary counter 7 and if the selected comparator changes the state, this state change is used to stop the counter.

In the example shown, the displaced equivalent stresses are defined by the following expressions: ν-, = k v / N, V2 = k v / N + v / 4

V ₅ = kv / N + v / 2, V ₄ = v / N + 3 v / 4

where k takes on the sequence of values between 0 and N / 4 in the course of this operation.

c. The synthesis

At the moment in which the time base triggers phase c, the logic selection circuit 5 gives the numeric counter to the counter 9 Value of the constant which characterizes the section identified in the course of the preceding identification phase. In the case of four sections, this numerical value is 0 for the first section and N / 4 for the second section the third N / 2 and for the fourth section 3 N / 4. N = the desired code resolution, i.e. the number of analyzed points.

These constants are indicated on the lower line of the diagram in Figure 8, which are a function of the position χ des Slide result in the amplitude u of the voltage supplied by the transducer and thus the sections P, as well as the Define equivalent stresses that correspond to them.

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The rest of the functional processes take place point by point as described above.

It must be noted that the case of the potentiometer with Slider, which results in a linear adjustment, can be changed to an angular adjustment (circular potentiometer), without having to change the arrangement itself. Even the case of position change sensors, which provides cylindrically coded signals is due to the case of angular position sensors. / Was den Regarding voltage divider 6, FIG. 3 shows the basic circuit.

This is a classic generator of balanced currents that is controlled by the auxiliary counter 7, which in the present case is a binary counter. For each digit ^; it has a resistor R and a transistor Q -: ά- in series, the output signals being formed by the voltage s. ; ϊ; ^: are, «tE which are obtained at the terminals of the resistor r in which the summation of the currents is effected. When the digit of the weight ρ of the counter passes through the state 1, * the corresponding transistor Qp is blocked, so that a current

U ₁ .

ip passes through the resistances Rp ^ r, the resistance r is itself very much smaller than Rp, the current ip is quite accurate VRp.

The usefulness of this facility, however, depends on the Applications different. The one used for the voltage divider Voltage ν is an alternating voltage, which is possible because the output voltage s, for example, only during one Part of the positive half-phase is used.

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On the other hand, the law of the summation of the currents is not linear, because the successive steps of the voltage s must follow a sine law as a function of η. In practical Case is the law of change achieved, due to the fact that the current ip has the value (τ - s) / Rp, fairly exactly parabolic, which with a suitable selection of the resistors E is a sufficient approximation to the sine law in the considered Interval (0-45 °) allowed.

However, the achievement of better solutions requires improvement this approximation by adding additional stages using correction currents. The profit on However, accuracy results in an increase in volume and in material price.

In order to avoid this disadvantage, according to a variant of the invention, a special transducer of the linear rotary type is used, that is to say that the output signal of the transducer is proportional to the angle θ in the quantification section (half-quadrant). This result is achieved by a special arrangement of the windings of the transducer. This relatively simple and inexpensive embodiment allows a linear voltage divider working with a balanced code to be used, which has the double advantage that it only counts a minimum number of steps and a relatively low counting frequency (50 K Hz instead of 200 K Hz as in the described example) prescribes J The voltage divider used according to the invention can either be based on the principle of increment, using a sequence of step-shaped signals or according to the principle of different weights, in which the amplitude of the reference voltage is a sequence of coefficients, e.g. 2 ° to 2 ⁿ , is assigned, are based.

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If the resolving power (number of points in the measurement interval) or the counting capacity over a given number of intervals exceeds the capability of the device described above, an arrangement according to the invention becomes suggested, for example in two stages, i.e. with two fineness levels, analogous to the classic double chain process the synchronous or remote display is proceeded. Using a mechanical reduction, there is now information due to the angular position of two arms, one "arm" roughly " and the other given "fine". Each of these angular positions is converted into a numerical value by a transducer-transducer arrangement of the type described above transferred »The definitive The value is obtained by combining the two partial values. On the one hand, this assumes that the use of a reduction has no influence on the resolution of the "coarse level" and on the other hand the indeterminacy due to synchronization errors between changing the values coarse and fine can be eliminated beforehand.

The numerical information fine of each numerical section coarse is intended to include 100 levels, for example. The theoretical The relative arrangement of the two numerical data is shown in FIG. In practice they see from the two stages Coarse and fine values delivered at the same time, which are achieved independently of one another, as shown in FIG. 5. the Displacements D, which can show themselves in one sense or the other, are due in detail to mechanical positional errors and the non-linearity of the signals of the revolution Drive backlash. It is therefore necessary to have the 'numerical information to be roughly corrected based on the more precise specification of the device fine, for displacements that e.g. + 1/4 of the interval can roughly reach, or in the event of

-17-. 90 982 2/0917

+ 25 units of the interval fine.

To this end, the device has roughly a double-acting resolution made necessary by the needs of the application is such that its specification not only defines the numerical value where the arm is roughly located, but also its half value. The complete information that is roughly based on the level is e.g .:

-44.1: The additional number, which has the value 1, indicates that the arm is roughly in the second half of the interval with the number 44 is located.

-45.0: The arm roughly is in the first half of interval 45.

Between the counters of the two stages and their common Memory enters a logical decision cycle to resolve the vagueness. This intervening consists in:

- Then add 1 to the value roughly if the additional "digit is 1 and the level fine returns a value that is between 0 and 25 (1st quadrant).

- Then roughly subtract the value 1 from the value if the additional Digit is 0 and the level fine delivers a value between 75 and 99 (4th quadrant).

This is illustrated in the example of Figure 6 in which the accumulated games are such that at the transition from 44 to of the value coarse (G), the state fine does not change from 99 to 0, but because its specification is 20 (F). At the through the position indicated by the arrow are the two indicated partial valors Carrying out the fact that the additional digit (es) is 1: coarse - 44.1 and fine - 15.

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In this case, logic decision circuit adds 1 to the Roughly add value and the information available on the output memory is 45 - 15 after this correction.

In a generalized arrangement "coarse - fine" with three Levels "coarse - medium - fine", in which, for example, 100 levels of fineness are provided, are the occurrence of indeterminacies to be treated in the same way as described for two stages in the previous example. The general The rule is:

P - roughly add 1 to the value if the additional Digit is 1 and the medium level provides a value that is between 0 and 25 (1st quadrant), or if the level fine returns a value between 00 and 25 (1st quadrant) with the medium level is above 99 (4th quadrant).

- Subtract 1 from the value roughly if the additional digit is 0 and the level medium delivers a value between 75 and 99 (4th quadrant) or if the level fine one . ' Returns a value between 75 and 99 (4th quadrant) with a medium level above 0 (1st quadrant).

- Add 1 to the value medium if the additional digit is 1 and the level fine has a value between 0 and 25 (I. Quadrant) returns.

- Subtract 1 from the value medium if the additional digit is 0 and the level fine has a value between 75 and 99 (4th quadrant) returns.

The invention has numerous advantages based on various points. First of all, the use of a Synchronous Überfrager or a circulator as a pick-up of the Angular position increased disturbances and weakness mechanical devices. The establishment

90982 2/09 Vl '

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according to the invention is robust and has a long service life. Because of the periodic nature of the signals, this allows Furthermore, to simplify the precise measurement and to reduce it to a fraction of the previous effort.

In contrast to incremental coding, which only uses the variations of the measured size quantified and which is consequently dependent on the previous measurements, allows the proposed transducer an absolute coding and delivers as a result, a numerical value which goes back to a fixed original value of the angle Q continuously.

The device accommodates a large number of requirements adapt to their application. The code in which the information is transmitted can be any one as well the resolving power (number of points in one revolution) in the measurement, where it is related to that peculiar to the system Accuracy remains tolerable. The transmission speed is practically only due to the maximum drive speed of the transducer limited. Since the information is contained in the amplitude of the signal, the analysis passes in immediately quantifying this amplitude, im Contrasted with the common piacis, which begins with the Modulation of the amplitude to convert it into a linear electrical phase modulation and then a phase shift to it quantify. About the effects of deviations in the transducer as well as external fluctuations or disturbances to switch off the transducer-transducer system, the measurement of the instantaneous amplitude is carried out according to the applied Method according to a differential method; The comparison the amplitude does not take place with a fixed potential, but with suitable reference voltages, which are in the same degree as the measured signals vary.

909822/0917

Claims (10)

Claims 1. Static coding device, characterized in that it comprises in combination an electromagnetic pickup for a position, in particular angular position, and an analog-numeric exchanger which analyzed immediately tude the implicit 'of the pickup γοη supplied signals. 2. Static coding device according to claim 1, characterized in that that the sensor for the position, in particular the angular position, is of the type of a synchronous transformer or Umlaufers belongs to different tensions supplies which represent a periodic function of the position to be coded, in particular the angular position « 3. Static coding device according to claim 1, characterized in that that the analog-numerical transmitter has a voltage divider, which a sequence of voltages supplies whose amplitude is proportional to a reference »Voltage, which also has comparators that compare the output voltages of the transducer with this sequence of voltages, as well as a logical selection circuit that ensures the prior selection of the two comparators in order to ensure the progress of the process and the identification of the comparator that its state has changed, and performs the control of a numerical counter which -an a memory supplies the corresponding numerical information corresponding to the detected by the pickup position, in particular angular position. 909822/0917 4. Static coding device according to claim 3, characterized in that that said divider is formed by a generator of balanced currents from an auxiliary counter is controlled. 5. Static coding device according to claim 3, characterized in that that a time base is provided through which the chronological order of the various operations is controlled. 6. Static coding device for a device in which a main arm and at least one secondary arm are provided to indicate the position, which is achieved by a mechanical reduction are connected to one another and circulate in a predetermined association, characterized in that each of the two arms is provided with a static coding device according to claim 1. 7. Static coding device according to claim 6, characterized in that that a logic decision-making circuit is provided between the counters and the output memory, in order to eliminate any uncertainties that may arise due to the non-floating of the transducers and / or the non-linearity of the analog signals will. 8. Static coding device according to claim 1, characterized in that that the sensor consists of a position sensor that sends a recorded signal to a number of comparators and in which the analog-numeric transmitter has a divider that each Comparator supplies a sequence of voltages, the amplitude of which is proportional to the reference voltage. ■ 80982 2/0917 9. Static coding device according to claim Ö "crnaurcn -g® · ^ indicates that the voltage divider supplies stepped voltages, the reference voltage being limited to the same values, the amplitude of which determines the voltage steps supplied by the voltage divider. 10. Static coding device according to claim 9, characterized in that that the desired resolution determines the number of sections and consequently the number of comparators. 809822/0917 L e r s e i f e