SU389540A1 - ; SCHAYAT - Google Patents

Description

one

The invention relates to computing and automation. The device, in particular, is intended to convert analog information about the angular position of an object into discrete form in the form of a code that can be used in a digital control system.

A position-code angular position transducer is known, containing an object scale containing ferromagnetic material and magnetic compensation elements of compensation type, which use the principle of the output signal to be used to compute it to the bullet when the code corresponding to the logical bullet is read ("O ). The interrogation windings of the readout elements are powered by a variable or pulsed tension of arbitrary shape. The code is formed by an electrical circuit by means of a village-vanilla signal corresponding to a logical unit ("1), at a certain level.

For the known character of the converter, the dependence of the moments of the formation of the boundaries of the code signals on the fluctuations of the supply voltage of the interrogation windings of the read elements and on the changes in the trigger level of the threshold elements. In addition, with the methods of output signal compaction, it is impossible to achieve the absence of

signal on the output winding of the reading element on the entire interval of the logical zero signal. All this leads to a decrease in the accuracy of the conversion of the angular position

object to code.

The purpose of the invention is to improve the accuracy and reliability of the device.

The proposed post-code converter is characterized in that the code scales in each bit consist of two code rings that are shifted relative to each other by half of the quantization step. The winding of the survey of each reading element consists of two counter-included sections on

the corresponding ends of the magnetic circuit connected to a pulsed power source, made in the form of a source of alternating voltages. The output winding of each reading element is located in the middle part of the magnetic circuit and is connected to the input of the code signal generation circuit, containing, in series, a unipolar body, a coincidence circuit, and a series conversion circuit

pulses in a continuous signal.

The use of rectangular voltage pulses with steep edges for powering the survey windings allows to obtain, at the output of the reading elements, pulses of greater amplitude, resulting in

differentiation of the fronts, since the amplitude of the output pulses is proportional to the gradient of the rise and fall of the signal on the interrogation winding. Obtaining a larger amplitude makes it possible to increase the accuracy of converting an angle into a code.

The parameters of the windings of the sensing elements and the frequency of the supply voltage are selected so as to ensure a clear differentiation of the fronts of the rectangular voltage supplying the sensing windings of the sensing elements.

The potential code signal in each bit of position-to-code converter is formed by a semiconductor unipolar zero-body, a coincidence circuit, and a series of pulses into a continuous signal. The zero-body triggers when a pulse of a given polarity appears at its input, and the response threshold is approximately two orders of magnitude less than the maximum value of the pulse signal taken from the output winding of the readout element, which leads to a significant decrease in the error in the formation of code signal boundaries from the threshold drift triggered null organ.

Fluctuations in the supply voltage of the interrogation windings of the reading elements in the proposed device do not affect the moment of changing the sign of the derivative, and therefore, practically the moment of forming the boundaries of the code signals, since this is determined only by the magnetic resistances of the circuit sections along the path of the magnetic fluxes from two counter-included winding sections of an onros reading element. The signal on the output winding of the balanced reading element is zero with the same magnetic resistance of both halves of the magnetic circuit of the reading element, i.e., when both ends of the magnetic circuit are at the numerical limits of the given code scale. Thus, the moment of change of the derivative derivative is determined only by the angular position of the code scale. After the zero-organ, the signal arrives at the coincidence circuit, to one input of which a strobe signal is fed from the power source of the interrogation coils of the reading elements, to the other, impulses from the zero-organ output. A circuit that converts a pulsed signal into a potential signal, corresponding to a logical unit, consists of an inverter, two transistor delay lines, and an OR circuit that unites them.

FIG. 1 is a diagram of the formation of a code sigal for one bit of a converter; in fig. 2 - time diagrams of voltages in different parts of the circuit; in fig. 3 - design of an electromechanical converter unit.

The ferromagnetic code scales 1 are made in the form of a drum, and the code track of each bit consists of two code scales.

rings shifted relative to each other by half of the quantization step in this category.

Differentiating composing reading elements 2 are installed against the code track in each discharge, each of which is made in the form of a cylindrical or U-shaped magnetic circuit with two windings: a survey winding 3 consisting of two sections connected oppositely and located on the edge of the magnetic circuit, output winding 4 in the middle. In order to compensate for the output signal in order for it to be equal to zero when the reading element is located at the numerical boundary, the output winding is moved along the magnetowire. When compensation is achieved, the winding is fixed in this position.

The winding of the interrogation 5 is connected to the source of a rectangular impulse voltage 5, the output winding 4 is connected to the input of the code signal generation circuit 6 containing a unipolar zero organ 7. One output of the coincidence circuit 8 is connected to its output, which performs the logical function "And and the other input of the same circuit is connected to the source of the pulse voltage 5. The output of the coincidence circuit is connected to the circuit 9, which converts a series of pulses into a continuous potential code signal of a logical unit.

In the time diagrams (Fig. 2), the following notation is taken: and a is the voltage at the output of the power supply to the windings of the interrogation of the reading elements;

Ub is the voltage at the output winding of the reading element; (Vc is the voltage at the output of the null organ; (7th is the voltage at the output of the coincidence circuit;

Ue is the voltage at the output of a series of pulses to a continuous signal (a lot-code signal of one bit of the converter);

3 - the delay time of the output signal. On the input shaft 10 of the electromechanical unit of the position-code converter (Fig. 3) mounted in bearings 11, cylinder 12 is fixed with ferromagnetic code scales /, which for each bit consist of two code rings 13 that are shifted relative to each other by half a step quantization in this category de. The code scales of all bits are combined into a multi-digit scale with a pin 14. The precise mutual arrangement of the code scales is ensured by the fact that the code pattern of each scale is made from a single base surface - holes for the pin 14. The multi-digit code scale of the team makes it easy to manufacture and improves manufacturability, since it is simultaneously possible to process code scales of the same bits for several transducers. Against code

The scales have an insulating board 15 fixed to the case with reading elements 2, the interrogation windings 3 of which are pressed into this board. Output windings 4 are located in the middle part of the magnetic cores of the reading elements.

When the input shaft is rotated with the code scales fixed on it, the magnetic coupling between the output winding of the reading element of the given discharge and counter-activated sections of the interrogation winding periodically changes. This determines the periodic change in the sign of the pulses taken from the output winding of the reading element and obtained as a result of the differentiation of the front and rear edges of the rectangular pulses entering the interrogation winding. When reading from the code scale of a logical unit, the polarity of impulses taken from the output winding is opposite to that obtained when reading zero.

The unipolar null organ 7 separates the pulses of a given polarity and forms them. At its output, pulses appear with a delay of 4 microseconds in time. This eliminates the possibility that the circuit will generate 8 false pulses when reading a logical zero from the code scale.

Two series of pulses go to the inputs of the coincidence circuit: to one input from the power source 5, to the other from the zero-body output 7. The pulse frequency in both series is the same, and when the unit is read, the moments of the pulses at the zero-organ output coincide with the moments of the presence of the impulses at the output of the power source, and when reading the nzl pulses

The output of the organ body appears during the absence of pulses at the output of the power supply. Thus, when reading a unit at the output of a circuit, there are

impulses, when reading zero they are missing. Circuit 9 converts a series of pulses appearing at the output of a coincidence circuit 8 into a DC signal. From the output of circuit 9, the noticeable code is removed.

single bit signal converter. The coding signal patterns in the remaining bits are as discussed.

Subject invention

15

A position-code converter containing codecaps, magnetic readout elements connected to a pulsed power source, and a form signal shaping circuit, characterized in that, in order to increase the accuracy and reliability of the device, the code scales in each bit consist of two code rings shifted each other by half

Quantization step, the scanner winding of the readout element consists of two oppositely included sections located at the respective ends of the magnetic circuit and connected to a pulsed power source pitan, made in the form of a rectangular voltage source, the output winding of the readout element is located in the middle part of the magnetic circuit and connected to the input of the circuit code generation

the signals contained in series are connected a unipolar null organ, a coincidence circuit, and a circuit for converting an IMP series into a continuous signal.