SU1001141A1 - Code-to-shaft angular position converter - Google Patents

Description

The invention relates to automation and computer technology and can be used in information output devices from a digital computer.

A code converter into a shaft rotation angle is known, which contains a voltage source, an octant switch, power amplifiers, functional generators, registers, and a sine-cosine rotating transformer (SCWT) 1.

A disadvantage of the known converter is the presence of a large number of analog blocks, which leads to a decrease in the reliability of the converter.

The closest to the proposed technical entity is a code converter in the shaft rotation angle, which contains an actuator, the shaft of which is kinematically connected to the shaft of the SSCR, the input winding of which is connected to the source of the reference voltage, and its output windings the amplifiers are connected to the inputs of the octant switch, the registers / summing amplifier and the inputs of which are connected to the outputs of the trans: octant switch, and the output is connected to the analog input of the converter - voltage, the digital inputs of which are connected to the code converter, and the output through the comparison unit and the servo amplifier is connected to the input of the actuator 2,

The known converter has a number of disadvantages:

relatively low accuracy

10, due to the non-linear relationship between the rotation angle of the ACS and the input angle code, leading to methodological errors. conversions greater than 0.5 °;

15

the need to provide certain transfer coefficients of the summing amplifier with an accuracy up to the fourth digit requires the use of highly stable precision elements, which complicates the device;

the presence of a large number of analog blocks (inverting amplifiers, an octant switch, a comparison unit, a summing amplifier) leads to a decrease in reliability caused by instability of operation in various operating conditions and a decrease in the accuracy of the converter.

The purpose of the invention is to increase the point 30. reliability and reliability of the converter.

The goal is achieved by the fact that in the code converter - into the shaft rotation angle, containing the first and second registers, whose outputs are connected to the code converter inputs, the first code converter is voltage, reference voltage source, servo amplifier, the output of which is connected to the input actuator, actuator shaft Kinematically connected to the shaft is a sine-cosine rotary transformer, fixed storage devices are introduced, the second transducer code is voltage and decryption the sign torus, the output of which is connected to the first inputs of the first and second converters code - voltage, the outputs of which are connected to the input windings of a sine-cosine rotary transformer, the output winding of which is connected to the input of the servo amplifier, the outputs of the code converter are permanently connected to the second inputs converters voltage code, the third inputs of which are connected to the input of the reference voltage source, the output of the first control register is connected to the input of the decoder sign.

The drawing shows a functional cxejvia converter code in the angle of rotation of the shaft.

The converter contains a register 1 decoder 2 characters, a converter 3 codes, register 4, permanent memory devices (ROM) 5 and 6, code-voltage converters (PKN) 7 and 8, reference voltage source 9, sine-cosine rotating transformer 10 , servo amplifier 11 and actuator 12.

The Converter operates as follows.

. The input angle code from the external device is written to registers 1 and 4, and in register 1 the code of the two most significant bits is stored,

and in register 4, the code for the lower bits of the angle. .

Register 1 controls the decoder 2 characters and the issuance, depending on the quadrant, in which there is a playable angle, direct or reverse code from the outputs of the converter 3 to the address inputs of the ROM 5 and b.

The decoder 2 characters is a standard binary decoder of a two-digit code (functioning according to Table 1), the output of which controls the sign bits of the PCN 7; and 8,

Table 1

Register code Sltfnts n) j s (nlcos)

ROM 5 and 6 are two identical permanent storage devices (ROM), the contents of which each memory cell is the value of the sine of the address code of this cell in the range from 0 to 1. Such memory blocks can be made by consumer. on the basis of progressed storage devices, for example the 556PT, 573RF series, as well as commercially available, programmed at the factory, for example IMS 505RBZ 0068 .... 0071.

From the code converter 3, direct angle codes in odd quadrants and reverse angle codes are received in even quadrants on r1 input of ROM 5, and forward codes of angle are in odd (2) codes on the address input of ROM 6.

Table 2

0-90 90-180 180-270 270-360

Pr my

Claims (2)

Reverse Reverse Pry Pry Reverse Pry My Reverse When the direct code is fed to the PZ 5 and B inputs and their outputs, the sine code value of the angle specified by the input code in the range from O to 1/2 is formed when the return code is fed - the sine of the angle up to F / 2, i.e. cosine value. Formed. The sine and cosine codes of the least significant angle bits are fed to the first inputs 7 and 8, which are four-quadrant digital-analog multipliers (they can be used for 572PA, IrvPA microcircuit chips), the second inputs of which are sign inputs , control signals are received from the output of the character decoder 2. The third analog inputs of VCP 7 and 8 receive a variable excitation voltage from voltage source 9. PKN 7 and 8 perform digital-analog multiplication of the voltage reference of source 9 by si The nus and cosine of the angle specified by the external device, taking into account the sign determined by the signals from the decoder 2, also has a pattern 4, that the pickup phase at the control panel 7 output coincides with the phase of the reference voltage of source 9 in the first and second quadrants the third and fourth quadrants, and the voltage phase at the output of the PCN 8 coincides with the phase of the reference voltage in the second and third quadrants and is opposite to the other quadrants. Due to this, voltage is generated at the output of PCN 7 and 8 and t) U j5 nuj-ts ne Ug (t) -U j5 "tiiwtcose, where UQ is the amplitude of the reference voltage} C) is the frequency of the reference voltage 9 - the angle LY input code. These voltages are applied to the input windings of the ACS 10, as a result of which a voltage is formed on the output winding of the ACS 10: U svnoots n 9co5at.-U, j3inujtcoses T4ol. Wt sit (9-oL) where d is the angle of rotation vgsha SSCT 10. The voltage from the output winding of SQWT io through the servo amplifier 11 is fed to the input of the executive device 12, which turns the shaft SQTT 1 until the output voltage mismatch about winding SCWT 10 will not become zero, Sri this 5tn (0-ot) O and 8 ct, i.e. shaft rotation is equal to the angle specified by the code from an external digital device. In the proposed converter, the accuracy of converting the code to the shaft rotation angle is determined mainly by the size of the ROM and PCN, and the stability and reliability of operation is ensured by the exclusion of analog nodes and and digital-to-analog integrated circuits. Testing the transducer layout using 9-bit ROMs and PKN confirmed the above, and the total conversion error, including temperature instability and the tracking system error, did not exceed 15. Invention code converter in the angle of rotation of the shaft containing the first and second registers , the outputs of which are connected to the inputs of the code converter, the first converter code is voltage, the source of the reference voltage, the servo amplifier, the output of which is connected to the input of the executive The drives, the actuator shaft are kinematically connected with the shaft of a sine-cosine rotary transformer, which are distinguished by the fact that, in order to improve accuracy and reliability, permanent memory devices are introduced into it, the second code converter is a voltage and a decoder of the sign, the outputs of which connected to the first inputs of the first and second transducers code - voltage, the outputs of which are connected to the input slips of the sine-sinus-rotating rotary field transformer, the output winding of which is connected to the input the servo amplifier, the code converter outputs are connected to the second inputs of the code-voltage transducers through third-party storage devices, the third inputs of which are connected to the input of the reference voltage source, the output of the first register connected to the input of the character decoder. Sources of information taken into account in the examination 1. Vulvet J. Sensors in digital systems. M., Energoizdat, 1981, p. 171. 2. Authors certificate of the USSR 703903, cl. H 03 K 13/02, 1977 (prototype). „J