SU1120386A1 - Shaft turn angle encoder - Google Patents

Abstract

THE CONVERTER OF THE SHEED OF THE TURN OF THE SHAFT INTO THE CODE; containing a series-connected pulse generator, the first frequency divider, the driver of the excitation voltage, the output of which is connected to one output of the rotor winding of a sine-cosine rotating transformer, the first and second phase detectors, the outputs of which are connected to the corresponding inputs of the adder, which is output through sequentially connected F1-1pter 5 a voltage-to-frequency conversion unit and a reversible counter connected to the first inputs of the digital comparison unit, to the second inputs of which Others are encoded in the first frequency divider, a null organ characterized by the fact that 5 in order to improve the accuracy of the converter, the second frequency divider, the switch and the current transformer element are entered into voltage. one pin of which is connected to another pin of the rotor winding of the sine-cosine rotating transformer and to the zero-orgas input to S and the other output to the common bus, the output of the zero-organ through the second frequency divider is connected to the cycle control inputs of the switch, the outputs of the stator windings A sine-cosine rotary transformer is connected to the first inputs, and the digital outputs of the comparison unit through the switch are to the second inputs of the first and south second phase detectors. Oh soo o5

Description

The invention relates to the field of automation and computer technology and can be used to communicate analog information sources with digital computing devices. The converters of the angle of rotation of the shaft into a code containing a sine-cosine rotary transformer, phase detectors, voltage to frequency converter, reversible counter, two decoders, sum of binary code, multiplication blocks, amplitude conversion unit j are known. The disadvantage of such a converter is its complexity. The shaft angle converter is converted into a code containing a series-connected pulse generator, a frequency divider, an exciter voltage generator, forming a power generator, and a sine-cosine rotating transformer (SCWT), the first and second phase detectors, whose outputs are connected to the corresponding inputs an adder, which is connected through a series-connected filter, a voltage-to-frequency converter, and a reversible counter, connected to the first inputs of a digital comparator, to the second input The outputs of the frequency generator of the power generator are connected, the quadrature outputs of the digital comparison device are connected to the first inputs of the phase detectors, to the second inputs of which are connected the outputs of the SCRT. The converter is simple, reliable, performed on serial elements of wide application 21. The disadvantage of the converter is the error caused by the inequality of the transmission coefficients of the phase detectors. The closest technical solution to the invention is a shaft rotation angle converter into a code containing a series-connected pulse generator, a first frequency divider, a drive voltage driver, the output of which is connected to one output of a rotor winding of a sine-cosine rotating transformer, first and second phase detectors, outputs which are connected to the corresponding inputs of the adder, the output of which is through a series-connected filter, the conversion unit is not directed to the frequency and the reversible counter is connected to the first inputs of the digital comparison unit, the second inputs of which are connected to the other outputs of the first frequency divider, the zero-organ, the outputs of the stator windings of the SCRT and the outputs of the digital comparison unit are connected respectively to one and the other inputs of the first and second phase detectors, the output of the adder via the zero-organ is connected to one input of the coincidence element, the outputs of the SCART are connected to the phase-shifting element, the output of which through the second zero-organ is connected to another input of the coincidence element , The output of the coincidence element is connected to the installation input of the reversible counter, and the outputs of the first frequency divider are connected to the third inputs of the reversible counter c. A disadvantage of the known converter is the error caused by the inequality of the transmission coefficients of the phase detectors. The aim of the invention is to improve the accuracy of the converter. The goal is achieved by the fact that in the converter of the angle of rotation of the shaft into a code containing a series-connected pulse generator, a first frequency divider, an excitation voltage driver, the output of which is connected to one output of a rotor winding of a sine-cosine rotating transformer, first and second phase detectors, outputs which are connected to the corresponding inputs of the adder, the output of which is through a series-connected filter, a voltage-to-frequency conversion unit and a reversible counter under Connected to the first inputs of the digital comparison unit, the second inputs of which are connected to the other outputs of the first frequency divider, null organ, the second frequency divider, the switch and the current-to-voltage element, the one output of which is connected to the other output of the rotor sinus-cosine of the rotating transformer and to the input of the nullorgan, and the other output to the common igin, the output of the null organ is connected to the control inputs of the switch through the second frequency divider, the outputs of the stator windings are sinus-cosine-rotating yuschegos transformer are connected to first inputs and the outputs of the digital comparator unit through a switch - to the second inputs of the first and second phase detectors. FIG. 1 is given the structural scheme of the proposed converter; FIG. 2 - graphs that show his work. The converter contains a series-connected pulse generator 1, a first frequency divider 2, a driver of the excitation voltage 3, a sine-cosine rotating transformer 4 with one rotor 5 and two stator 6 and 7 windings, the outputs of which through the switch 8 are connected to the first inputs of phase detectors 9 and 10, the outputs of which (Connected to the corresponding inputs of the adder 11. The output of the adder 11 through a series-connected filter 12, the voltage-to-frequency conversion unit 13 and the reversing counter 14 is connected to the first m inputs of the digital comparison unit 15, to the second inputs of which other outputs of the first divider 2 hours are connected.The second output of the rotor winding 5 of SSCT 4 is connected to the input of the zero-organ 16, the output of which is connected via a series-connected second frequency divider 17 to the control input of the switch 8, and through a current-to-voltage conversion element 18 with a common voltage, the outputs of the digital comparison unit 15 through the switch 8 are connected to the second inputs of the phase detectors 9 and 10. The converter operates as follows. f generator 1 reduces the frequency in the first divider 2 frequency. The output pulses of the divider 2 frequency are converted in the driver of the excitation voltage 3 into a sinusoidal voltage (t.The output voltage of the ACC and sincotsinCf and Usirio t cost (C) is the angle of rotation of the shaft) from the stator windings 6 and 7 through the switch 8 to the first inputs of phase detectors 9 and 10, respectively. From the outputs of the digital comparison unit 15, through the switch 8, the second inputs of the phase detectors 9 and 10 receive rectangular periodic pulses, whose phase is proportional to the angle of the first output of the digital comparison unit 15, followed by the tracking system, to the input of the phase detector 9; , the main harmonic of which is sin (ut-H (j), and from the second output to the input of the phase detector 10 are pulses, the main harmonic of which is cos (CJt-i-tp), where y is the angle worked by the tracking system, whose code is stored in reversible counter 14. The voltage Esin (0t on the element (resistor) 18, the phase of which coincides with the phase of the excitation current and the output EMF of the windings 6 and 7, is fed to the zero-body 16. The zero-body 16 produces pulses with a duration equal to half the supply period voltages that go to the second frequency divider 17. From the output of the frequency divider 17, pulses with a duration 2 times longer than the supply voltage period go to the control input of the switch 8i Switch 8 performs pairwise switching of the inputs of the phase detectors 9 and 10. Phase detectors 9 and 10 multiply the voltages applied to them. As a result, with one state of the switch 8, voltage (Jg Esin15ТЦ) -k- -sin uittj)) J and, d E S40 wi appear at the outputs of the phase detectors. C)) where (1-t-Sk) and (1-6 |) are the transfer coefficients of phase detectors 9 and 10. These voltages are fed to the input of summing amplifier 11, the output of which is the voltage constant uuU KOToporo proportional to the mismatch between the actual angular position of the shaft 4 and the indication of the reversing counter, i.e. the angle (which the tracking system worked out. The alternating voltage component is suppressed by filter 12. After switching the switch 8 to a different state, Ug E5ina voltages appear at the outputs of the phase detectors), + y), e Sin cot ein Cp kj-.540 (.u) t + qj), in this case a constant voltage component appears at the output of the summing amplifier

Ek. , EkSx (c -) (C4C)

The error voltage and And comes through the filter 12 to the input of the block 13 voltage conversion in

  / frequency Component - g-5 m ();

periodically changing its sign is suppressed by filter 12.

Ek Component ((as

a constant voltage goes to the input of the voltage-to-frequency conversion unit 13, which causes a sequence of pulses to input + or an input - reversible counter 14, depending on the sign of the AU, the discrepancy Ц - ц) decreases to zero.

Thus, the error due to the inequality of the transmission coefficients of the phase detectors is suppressed by the filter, as a result of which the accuracy of the converter is increased.

The economic effect of using the invention is determined by its technical advantage.

Claims (1)

A SHAFT TURN ANGLE CONVERTER TO A CODE containing a series-connected pulse generator, a first frequency divider, an exciter voltage generator, the output of which is connected to one output of the rotor winding of a sine-cosine rotating transformer, the first and second phase detectors, the outputs of which are connected to the corresponding inputs of the adder, the output which through a series-connected filter, a voltage-to-frequency conversion unit, and a reversible counter are connected to the first inputs of the digital unit, to the second inputs of which other outputs of the first frequency divider are connected, a zero-organ, characterized in that, in order to increase the accuracy of the converter, a second frequency divider, a switch and a current-voltage conversion element are introduced into it, one output of which is connected the other end to a rotary sine-cosine winding of the rotary transformer and to the input of the zero-bodies, and the other terminal - to a common bus, g-body output zero through a second frequency divider ⁴ Tel is connected to the control inputs of the switch, the outputs of the stator the winding of the sine-cosine rotating transformer is connected to the first inputs, .. and the outputs of the digital comparison unit through the switch are connected to the second inputs of the first and second phase detectors. SU.,., 1120386 1 '1120386