SU734777A1 - Shaft angular position-to-code converter - Google Patents

Description

(54) CONVERT (SHEEPER ANGLE OF TURNING SHAFT INTO CODE

one

The invention relates to automation and computer technology and can be applied in information and control automated systems using digital information logic machines.

The converters of the angle of rotation of the shaft into a code are known, which contain a sine-cosine angle sensor, the outputs of which are connected to the inputs of transformers through a key block, the output windings of transformers are connected to each other via switches and connected to a voltage conversion block in the key block, control inputs of keys and a voltage-to-code conversion unit is connected to the outputs of the logic control unit jlj.

The disadvantages of the known transducers are complexity and low noise immunity.

The closest to the invention ow etc converter angle of rotation of the shaft

In a code containing a sine-cosine angle sensor, the outputs of which through the demodulator block are connected to the inputs of the amplitude comparators block and the inputs of the key block whose output is connected to the input of the voltage-to-voltage conversion unit, the outputs of the logic control unit are connected to the control inputs of the key block and a voltage conversion unit in code 1.23.

The disadvantage of this converter is its low reliability, caused by the need to apply multi-digit voltage to koi conversion.

The circuit of the invention is to increase the reliability of the converter.

This is achieved by introducing a block of zero-organs and transformers whose primary windings are connected respectively to the sine-cosine outputs of the angle sensor, the secondary windings of the transformers are interconnected and connected to the corresponding inputs of the demodulator unit, whose outputs are connected to the inputs logical control unit. FIG. 1 shows a functional diagram of the proposed converter in FIG. 2 is a graph of voltage versus rotation angle. The converter contains a sine-cosine angle sensor 1, the outputs of which are connected to the corresponding primary windings 2 and 3 of transformers 4, and 5, which have corresponding secondary windings b and 7, the number of which is selected depending on the size-convertible code in a coarse reading and for a pyramid coarse code, it is equal to 7 (see Fig. 1 /. The first, third, and fifth beginnings and ends of the sixth and seventh secondary windings 6 of transformer 4, as well as the beginning of the first and ends of second and fourth secondary windings of the transformer 5 sc Connected to the corresponding inputs of the demodulator block 8. The first, second, third and fourth secondary windings 6 are connected by the corresponding secondary windings 7 according to, the rest are arranged on the order of, nor the secondary windings 6 and 7 of transformers 4 and 5 are opposite. 6 and 7 are connected to the common bus. The transformation coefficients of AND of transformers 4 and 5 are chosen as follows: Transformer 4 (indices after 1 correspond to the order of the second windings 6). 1 22 ° 30 O, 3827 45 0.7071 6730, 0.0239 O, 3827 45 O, 7071 6730 0.9239 transformer 5 (indices after 2 correspond to the order of the secondary windings 7). o / Vl „„ soy 0.9239 12 112 ,, ° ° 0.7071 n C09 67 ° ZO 0.3827 P25 soy 22 ° 30 0.9239 2t, cos 45 0.7071 n, Cos22 ° 3O 0.3827 So Thus, the VI transform coefficients and the number of secondary windings correspond to the sine or cosine of an angle within 2 ° OZ from one value to another, which corresponds to an angular transformation within two quanta of the lowest bit of the five-bit code. By the same principle, a converter can be constructed with any number of bits per coarse reading. The outputs of block 8 of demodulators are connected to the inputs of block 9 of comparators and block 10 of null organs, the outputs of which are connected to the inputs of logic control block 11, the No. 1 inputs of which are the outputs of the 5 highest bits of the code and the inputs of block 12 keys, the other inputs of which connected to the 61st input of the 8 demodulator block; the outputs of the key block 12 are connected to the input of the voltage-to-code block 13. The Converter operates as follows. From the outputs of the sine-cosine angle sensor 1, the voltages are removed: u Usine-5moL t, U -Uco-B-sinujt, the amplitude of the supply voltage; power supply frequency; angle of rotation; UC, Constant voltage, respectively, from the sine and cosine output of sensor 1. Voltages (J and U, respectively, are supplied to the primary windings of sine 4 and cosine 5 transformers. For further conversion, eight voltages are needed, each of which is shifted relative to each other by 22 ° 3O .. Some voltages have to be taken in opposite polarity to produce a saw-tooth curve (thickened line in Fig. 2). The voltage .Sine-n -sma t and sin Wax is removed from the first secondary winding of the transformer 4. Others Nor, taken from the outputs of transformers 4 and 5, are defined as follows: Ujif U-sine r -siniwt-vU-cosen.sintuts U.ain (9 + 2Z ° 3O), sin (jot) This voltage is taken with a negative sign. + Uc039n - "slnUJt 23 U9in () -% lnout. U -Usin (e467 ° 30) smcut., Cos0 s nu t V3cosQ-9inu) t. Voltage U is taken with a negative sign. Ug, Un, gCOsesinujt-Un aineeinart , U., Ucos (ef45 °) .9muui 8tn (67 ° 30) em cut

Eight applied voltages are applied to a block 8 of demodulators, the H / J output of which is allocated the envelope voltage, shifted relative to each other by an angle. (see Fig. 2).

and. - u-sin e

and, U-siM (e + 22 ° AOR) and, and-Sin (0+ 45 °)

 -sin (0+)

05 and-cos e

and and C05 (0 +)

U U-COi (0+ 45)

Ug U-cos (b + 67 ° 30). The demodulated voltages are pairwise compared with the comparators of block 9.

The null organs of block 10 determine the polarity of the voltage envelopes depending on the angle of rotation of the shaft of the sensor 1.

The polarity of each of the eight voltages, as well as the relationship between the amplitudes of the voltages, can be formed five higher bits. The outputs of the comparators and the zero-bodies come to the control logic unit 11, the output of which forms the five most senior coarse bits.

Five higher bits are fed to the control inputs of the 12-key block. The price of the junior bit of the pyramid-type koi is: Ii ° i5, i.e. every ugda

2 ,, oir. /

11 15 corresponds to the fishing sector

your code. When a code key arrives at the control inputs, the input of the voltage conversion unit 13 turns on the corresponding voltage from the output of the demodulator block 8 at the maximum linearity interval, i.e. when passing the envelope through the zero level. For example, the voltage Ujj (see Fig. 2) is connected to the input of the voltage converter in the code in the intervals of 11 ° 15, and 19115 -.

The deviation from the straight line in these areas is 30 angular seconds. Thus, five most significant bits are formed in the converter, and the remaining bits are determined using block 13.

In the converter, you can increase the number of higher bits by increasing

the number of secondary circuits of transformers and null organs, namely, two times for each discharge. The five most significant bits are used to connect to the input of the linear voltage unit 13. The voltage to be converted is connected to the voltage conversion unit 13 in a code ranging from 0 to 11 ° 15, where the linearity is very high, in contrast to the known one, in which the voltage to be converted is connected to a similar block ranging from 0 to 45. This allows the use of multi-bit voltage-to-code conversion blocks, i.e. allows you to increase the size of the converter angle of rotation of the shaft into the code as a whole. In addition, the formation of five and older bits of ppg allows to reduce the requirement for a unit to convert a code into a code.

Claims (2)

1.Zverev AE and others. Converters of angular displacements in a digital code. 1974, p. O8-11O. 2. Author's USSR Svinelstvo № 47О841, cl. G O8 C 9 / OO, published. in 1975 (prototype).