SU845167A1 - Shaft angular position-to-code converter - Google Patents

Description

(54) CONVERTER ANGLE OF TURNING SHAFT INTO CODE

The invention relates to the field of automation and computer technology and can be used in information-measuring and navigation systems for performing two operations: converting the angle of rotation of the shaft into a code and Converting the polar coordinates of a moving object into rectangular. A device is known that contains a sine-cosine rotating transformer (SCART), the sine and cosine windings of which are connected to serially connected digital control resistors through a switch and fixed resistors, the common connection point of which is connected to the conversion unit through the error signal. code, the outputs of the bits of which are connected to the control inputs of the digital controlled resistors ij. The closest in technical essence to the invention is a device comprising a SSCT, sine and cosine windings of which through a switch are connected to serially connected digital control resistors, the common connection point of which is connected to the input of the voltage conversion unit to the code whose bit outputs are connected. to the control inputs of digital controlled resistors connected in parallel with the fixed resistors f2j. These devices are only intended to perform the operation of converting the angle of rotation of the shaft into a code, which limits the class of tasks it performs. The aim of the invention is to extend the functionality by performing (in addition to the Main) operations of converting polar coordinates into rectangular coordinates. The goal is achieved due to the fact that your turn into a code, SCRT contents, whose sinus and cosine windings are connected via KOhe yxarop with the first and second power supply of the resistive voltage converter and the voltage conversion unit into the code, the code transmission block is entered. , a register and a switch, the break contact of which is connected to the first output of a resistive voltage conversion unit, the closing contact is connected to the analog one

the input of the converter, and the moving contact with the input of the voltage conversion unit to the code, the output of which is connected to the first input of the transmission unit of the code. The input of the register is connected to the digital input of the converter, and the output is connected to the second input of the block, the transmission of a code whose output is connected to the control input of a resistive voltage conversion unit, the second and third outputs of which are connected to the corresponding outputs of the converter.

In addition, a resistive voltage conversion unit containing a first constant resistor and a first digital controlled resistor, the first terminals of which are connected to the first power line of a resistive voltage conversion unit, the second power line of which is connected to the first output resistive voltage conversion unit the control inputs of the first and second digital control resistors are connected to the control input of a resistive voltage conversion unit, switches are entered Ate and additional digital controlled resistors. The first output of the first additional digital controlled resistor is connected to the second power bus, the second output is connected to the moving contact of the first switch, the opening contact of which is connected to the first code of the resistive voltage conversion unit, and the closing contact is connected to the second output of the resistive voltage conversion unit, and through a second digital controlled resistor with a common bus. The first pin of the second additional digital controlled resistor is connected to the moving contact of the second switch, the break contact of which is connected to the first power supply bus, and the closing contact to the common bus. The second output of the second additional digital controlled resistor is connected to the movable contact of the third switch, the disconnecting contact of which is connected to the first output of the resistive voltage conversion unit, and the closing contact to the second output of the first digital controlled resistor and the third output of the resistive voltage conversion unit. The second terminal of the first constant resistor is connected via a disconnect switch to the first output of the resistive voltage conversion unit.

The drawing shows a block diagram of the proposed device.

The Converter contains SCWT 1, the sine and cosine windings of which are connected via switch 2

to the power supply buses of the resistive voltage conversion unit 3, containing direct resistors 4 and 5, the first terminals of which are connected to the power buses 6 and 7. The second output of the resistor 4 is connected via disconnecting key 8 to the output 9 of the unit 3, the second output of the resistor 5 is connected to exit 9 directly. The first pin of the digital controlled resistor (LRC) 10 is connected to the power bus 6, and the second to the output 11 and the closing contact of the switch 12, the normally closed contact of which is connected to the output 9, and the moving contact via the digital controlled resistor 13 to the moving contact of the switch 14, the opening contact of which is connected to the power rail b, and the break contact to the common bus. The opening contact of the switch 15 is connected to the output 9, the closing contact is connected to the output 16 and through a digital controlled resistor 17 with a common bus, and the moving contact through a digitally controlled resistor 18 with a power bus 7.

The shaft rotation angle-to-code converter contains a switch 19, the closing contact of which is connected to the analog input 20, the opening contact to output 9, and the moving contact to the input of the voltage-to-voltage block 21, the output of which is connected to the first input of the code transmission block 22 The output of which is connected to the control input of the unit 3. The input of the register 24 is connected to the digital input .25, and the output to the second input of the block 22 of the transmission of the code.

The converter works in two modes. In the first mode of operation, the mode of converting the angle of rotation of the shaft into a code, the signals of the following form are removed from the output windings of the SCRT 1:

(one)

 i niwt s i p0,

  i niwt cosd, (2)

where and

uu is the amplitude value and

m is the circular frequency of the power supply voltage;

d

- a corner of turn of a rotor of SKVT,

- transformation coefficient, constant for this type of sensor

(k const).

Claims (2)

Analysis of the sign of the phase (relative to the voltage U of the power supply) and About the amplitudes of these signals in switch 2 (which usually consists of the octant selector and the keys it controls) makes it possible to determine a 45-degree section of the angular axis (octant) within which the desired angle of rotation is located; assign to it the three most significant bits of the output code; select the smaller and larger Ug from the indicated signals (in 1,4,5 and 8 th octants; in the remaining octants and and; and C and, finally, connect them with polarity to the bridge circuit (and connects to resistor 4 , a and - to resistor 5.) In this mode of operation of the converter, all switches 12, 14, i5 and 19 are set to position 1, and key 8 is closed. In this case, the first chain of parallel-connected SDGs 13 is turned on in one of the shoulders of the bridge circuit and the resistor 4 0 1.8 X Rj II R ,, 1.8 + x R, -, RR, respectively, the resistance of SUR 13, resistor 4 and the first chain of these elements, with connected in parallel; the total resistance of SDG 13; the relative value of the control code N (x N / N, and the voltage to the other (anti-patch for the first shoulder of a second chain of parallel-connected SDG 18 and a resistor 5 (lx) R l, 8xR (4 ) o n o -) 4- 2,8-x - respectively, the resistance of the SUR 1 of the resistor 5 and the sec of the chain of these elements are connected in parallel; R is the full value of the resistance of the SUR 18 (in this case, you can take R "RO ). The common connection point indicated from the strings is connected to voltage conversion unit 21 into a code that, through code transfer unit 22 installed in the appropriate position, controls SDGs 13 and 18, changing their resistance in such a way as to bring the bridge circuit into equilibrium defined by the condition (3) Since the ratio R -, / fU taking into account expressions (3) and (4), 9x-X -, y, 1.04 X, 8-0.9X-X2-4T 1, 8 (1-X) 2.9-X, then expression (5), taking into account expressions (1), (2) and (6), follows (in 1,4,5 and 8 th octants, where and „-and and Ug U, j) from where. those. the output code of block 21 at the moment of equilibrium of the bridge circuit is proportional to the angle of rotation 0 of the torus SCWT. In 2,3,6 and 7 th octants, where and from the expression (5) and "and. and ue, taking into account expressions (1), (2) and (6), similarly, we obtain, (e;. ie, in these octants, the rotation angle of the rotor of the SCRT corresponds to the inverse value of the output code of block 21. Regardless of the octant number, the characteristic device transformations are linear, which directly follows from the analysis of expressions (7) and (8). In the second mode of operation - the mode of converting polar coordinates to rectangular, all two-position switches 12, 14, 15 and 19 are set to position 2, switch 2 is disabled ( or it is installed in one kind of half-surround in the whole range In the zone of change in a, key 8 is open, since the formation of the error signal processed by block 21 does not require the shoulders of the bridge circuit formed by a certain combination of main and additional SDGs to perform other functions independently of each other. at the indicated position of the switches, the additional SDGs 10 and the SDGs 13, which form the first discrete divider, and the other arm, the SDG 18 and the additional SDG 17 (with normally open keys), which form the second DDN. The code transmission unit 22, depending on the form in which the radius is defined — the vector in the polar coordinate system, is set to one or another position. If the radius vector is specified in digital form - as a code at the input 25 of the device, then it is entered into register 24, and block 22 connects the bits of the latter to the control inputs of all SDGs; if the radius vector is enclosed in analog form in the form of voltage at the device input 20, it is digitally transferred by block 21, and block 22 connects the bits of the latter to the control inputs of the same SDGs, Connect the corresponding windings of DCS to DCN (directly or via switch 2) gives, taking into account expressions (1) and (2) Oy Axsin6, (9),} j Axcos9, UO) where A kU const .. The known equations describing the conversion of polar coordinates to rectangular ones have type R, S i p f R where R, H is the radius vector and the argument in the polar coordinate system ; Ry, RX are the radius-vera components in a rectangular coordinate system. From a comparison of expressions (9) and (11 (10) and (12), it follows that in this mode, the device converts the polar coordinates Rf ((the radius vector R is given as a code with a relative x value or voltage; the argument if in the form of the angle of rotation Q of the rotor of the SCWT) into rectangular Rу, R (are given in the form of Uy and U taps; (alternating current from midpoints and corresponding DDN). Thus, the proposed device provides two operations: convert the angle of rotation of the shaft in the code and convert the polar coordinates of the object to the right angle which expands the class of problems solved by the device; Invention 1. A shaft rotation angle converter V-code containing a sine-cosine rotating transformer, the sine and cosine windings of which are connected via a switch with the first and second power supply bus of a resistive voltage conversion unit, and a voltage conversion unit in a code, characterized in that, in order to expand its functionality, a code transmission block, a register and a switch, the opening contact of which is connected to the first output, are entered into it A resistive voltage conversion unit, a closing contact is with the analog input of the converter, and a moving contact is with the input of the voltage conversion unit into a code whose output is connected to the first terminal of the code transmission unit, the register input is connected to the digital input of the converter, and the output is the second input of the transmission unit of the code, the output of which is connected to the control input of the resistive voltage conversion unit, the second and third outputs of which are connected to the corresponding outputs of the converter. 2. The converter according to claim 1, characterized in that a resistive voltage conversion unit comprising a first constant resistor and a first digital controlled resistor, the first terminals of which are connected to the first power bus of the resistive voltage conversion unit, the second power bus of which is connected through the second constant resistor with the first output of the resistive voltage conversion unit, and the control inputs of the first and second digital controlled resistors are connected to the control input of the resistive input unit switches, additional digital controlled resistors are introduced, the first output of the first additional digital controlled resistor is connected to the second power bus, and the second output is to the moving contact of the first switch, the break contact of which is connected to the first output resistive conversion unit and the closing contact is connected to the second output of the resistive voltage conversion unit and through a second digital controlled resistor with a common bus, the first output of the second This additional digital controlled resistor is connected to the moving contact of the second switch, the breaking contact of which is connected to the first power supply bus, and the closing contact to the common bus, the second output of the second additional digital controlled resistor is connected to the moving contact of the third switch, the breaking contact of which is connected to the first output of the resistive voltage conversion unit, and the closing contact with the second output of the first digital controlled resistor and the third output resistive voltage conversion unit, the second output of the first constant resistor is connected via a breaker switch to the first output of the resistive voltage conversion unit. Sources of information taken into account in the examination 1.Schmid N. An-electronic design-and-technical and electronic converters Electronic-Design, No. 7, 1970, p. 57, p. 20. 2. USSR Author's Certificate No. 502389, cl. G 08 C 9/04, 14.10.74 (prototype). ff