SU670953A2 - Double-counting electromechanical converter of shaft angular position into digital code - Google Patents

Description

connected to one of the inputs of the comparing element, the output of the non-periodic signal source is connected to one of the inputs of the conversion unit of the reference signal, the other input of which is combined with the corresponding input of the conversion unit of the analog signal and connected to the output of the frequency divider, the input of which is connected to the pulse generator the reference signal is connected to the first input of the divider of the reference signal, the output of which is connected to the second input of the comparing element whose output is dinene with one of the inputs of the reversible counter, the other input of which is connected to the output of the pulse generator, the outputs of the reversible counter connected to the other inputs of the divider unit of the reference signal and through the key block to the input of the display unit.

The functional diagram of the converter is presented on the chart.

The converter contains a two-count sensor 1 consisting of a multipole transformer 2 accurate reference and a bipolar multiphase transformer 3 coarse reference, a source of a periodic signal 4, phase-sensitive amplifiers 5 and elements of shunting 6, forming in combination the channels of coarse 7 and exact 8 counts, coarse and fine tuners of counts 9, blocks of keys of coarse readings 10 and accurate readings And, keys of alternating current 12, amplifier of alternating current 13, valve 14, element And 15, control unit 16, element NOT 17, control unit 18 and the display unit 19. When the input shaft rotates and, consequently, the rotor of the two-meter sensor, the useful signal of the positive sign on the output of the shunting elements in each of the samples alternately occurs, and the cycle of polling all the phases of the exact sensor reads in the interval of the useful signal from the output of the shunt element, a certain phase of the rough reference. Elimination of possible mismatches of rough and accurate sensor readings is provided by the synchronization implemented on blocks 15, 16, 17, 18.

The phase switching unit 20, one group of inputs of which is connected to the outputs of the precise sensor reading, and the other - to the outputs of the elements of the accurate reading shunting 6, converting the analog signal block 21, converting the reference signal block 22, the reference signal divider block 23, pulse generator 24, divider frequency 25, reversible counter 26, comparing element 27, key block 28. The output of switching unit 20 is connected to one input of an analog signal conversion unit 21, another input of block 21 is connected to output of frequency divider 25. One in the conversion unit 22 is connected to the output of a periodic signal source 4, the other to the output of frequency divider 25. The output of the analog signal conversion unit 21 is connected to one of

the inputs of the comparing element 27, the output of the conversion unit of the reference signal 22 is connected to one input of the divider unit of the reference signal 23, the output of which is connected to another input of the comparing

element 27. The output of the pulse generator 24 is connected to the input of the frequency divider 25 and one of the inputs of the reversing counter 26, the second input of the reversing counter plug; to exit) comparing element.

The outputs of the reversible counter are connected to the inputs of the key block 28 and with the group of inputs of the reference signal divider, the output of the key block is connected to the input of the display unit 19. The operation of the converter is as follows. The angular position of the converter input shaft is converted by rotary transformers 2 and 3 into voltages removed from the output windings (phases) of the transformers and having a value proportional to the angular position of the shaft. The windings have a spatial shift of F1 in the coarse reading and

2

F2 --- EXACTLY. Here: p.2p

t is the number of phases in a rough reading; n - the number of phases in the exact reading; P2 - the number of pairs of poles in the exact counting;

.

To describe the device and the principle of operation of the converter, we assume that / n 4, n - 1. A necessary condition for the appearance at the output of the shunting element

the positive sign signal in both the rough and exact readings is the presence at one of its inputs of a positive signal from the output of the phase-sensitive amplifier of the same phase of the sensor n on the other -

negative signal from the output of the phase-sensitive amplifier subsequent phase. When the sensor shaft is rotated, the useful signal is output alternately at the output of the shunt elements inside the sweep, and the polling of all the phases of the exact sensor reading occurs in the interval of the useful signal from the output of the shunting element of one of the coarse phases. Elimination of possible errors in the weekend

The code of the converter arising in the zone of asymmetry of the zero points of a bipolar rotary transformer is provided by the synchronization of readings implemented using blocks 15, 16, 17, 18.

To achieve this goal, i.e., increase the accuracy of the converter's reference, each of the phases of the sensor's exact reference is connected to the corresponding input of the phase switching unit, which provides the connection of the output of the necessary phase of the exact reference to the input of the analog signal conversion unit. This is ensured by the fact that the outputs of the shunt elements of the exact countdown are connected to another group of inputs of the phase switching unit and the input of the block 21 is connected only to that phase of the exact counting, at the output of the shunt element of which there is a control signal of a positive sign.

The signal from the output of sensor 1, amplified and converted to a direct current signal in block 21, is fed to the first input of the comparison element 27. From the output of a periodic signal source through a converter unit of the reference signal with the same parameters as the analog, the reference voltage is supplied to the input of the divider unit 23. The other inputs of the transforming units 21 and 22 receive pulses from the pulse generator 24 through the frequency divider 25 with a frequency equal to the frequency of the periodic signal from the output of block 4. Signal amplitude constant t Single outlet units 21 - 22 of the periodic signal proportional to the amplitude and the sign corresponds to the phase of the periodic signal. Control signals from the outputs of the reversing counter 26 are fed to the other group of inputs of the divider of the reference signal, which provide the output of the reference signal divider of a series of reference voltage levels to the second input of the comparison element. At the output of the comparing element, a control signal is formed, the polarity of which is determined by the results of the comparison, arriving at one of the inputs of the reversible counter, and the second input of the counter receives trigger pulses from the pulse generator. At the outputs of the reversible counter, a code is thus generated that is proportional to the amplitude of the output signal from the phase of the exact reference and, consequently, to the angular position of the input shaft. The key block 28, controlled by signals from the output of the reversible counter, provides ignition of the necessary digits in the display block 19.

An advanced converter makes it possible to obtain a high conversion accuracy;: and the use of an increase in the mass-gab | -it1: s 10 :: azlsley. The reading device is made completely on commercially available circuits.

Claims (1)

Invention Formula Dupuits: from; the second electromechanical converter of the angular position of the shaft into a digital code according to the author. St. No. 585515, in order to improve the accuracy of the converter, a phase switching unit is inserted into it, an analog signal converter that converts, a reference signal converter, a frequency divider, a frequency generator, a comparison element, a reversible counter, a key block and a reference signal divider , the outputs of the precise reference of the sensor are connected to one group of inputs of the phase switching unit, the other group of inputs of which is connected to the outputs of the reference accuracy channel, the output of the switching unit is connected to one of the inputs converting an analog signal block whose output is connected to one of the inputs of the comparing element, the output of the periodic signal source is connected to one of the inputs of the reference signal converting unit, the other input of which is combined with the corresponding input of the analog signal converting block n is connected to the output of the frequency divider whose input is with pulse generator, the output of the conversion unit of the reference signal is connected to the first input of the divider unit of the reference signal, the output of which is connected to the second input of the comparing element, the output of which is connected to one of the inputs of the reversible counter, the other input of which is connected by the output of the pulse generator, the outputs of the reversible counter to the other inputs of the block detitetit.tey reference signal and through the unit to, 1yuch - with the input of the display unit. Sources of information taken into account during ekyierties 1. USSR author's certificate 0 L9 585515, class G 08 C 9/00, 1977. Yu