SU750536A1 - Shaft angular position-to-voltage converter - Google Patents

Description

one

The invention relates to automation and can be used in electric drive engineering as an element of auto adjustment systems.

A device for remote angle transmission is known, comprising an inductosyn sensor, the windings of which are connected to the windings of the inductive receiver-receiver, the matching signal amplifier and the executive unit 1 through the windings of the inverting transformer

The closest technical solution is a rotor angular displacement transducer into an analog 15 signal containing matching amplifiers, the outputs of which are connected to two outputs of the comparison circuit and through resistors to the inputs of the phase-shifting amplifier whose outputs 20 are connected to the second limiting amplifier, the third the circuit input is connected to the input of a square pulse shaper connected via a transformer to the rosin of the selsyn-sensor, the second output of the square pulse shaper through The first switch is connected to the second input of the trigger, the comparison circuit through the 3D 3D

the trigger is connected to the second and third switches, respectively, connected to the inputs of the phase-shifting amplifier (2J.

The known device operates on the principle of forming a variable phase signal and converting a variable phase signal dependent on the angular position of the rosin sensor rotor into a signal analogous to the angular position of the direct current.

The disadvantages of the known devices are low conversion accuracy and low reliability of the device.

The purpose of the invention is to improve the accuracy and reliability of the converter.

The goal is achieved by the fact that a null organ, a signal level regulator, a selective filter, a sign analyzer, are introduced into the device. a pulse front target unit, two conversion scale verification elements, a threshold detector, a delay unit, a reference voltage source and a key, a selsyn power winding are connected to the zero-organ input, the outputs of which are connected to the threshold detector via the first switch, step ;. which through the delay block is connected to the input

the first element of the conversion scale conversion and with the first input of the element; the memory, the output of the signal level regulator through a serially connected selective filter, a sign analyzer and a pulse edge selection unit are connected to the input of the second element of the transformation Tt conversion and the second input of the memory element whose outputs A second switch is connected to the first input of the key, the second input of which is connected to the output of the reference voltage source, and the output is connected to the input of the integrator.

At 4epte) Ke I presents the block diagrams of the device.

The device contains a selsyn 1, a transformer 2, a capacitor 3 and a phase-shift resistor 4, a signal level controller 5 (potentiometer for equalizing the coefficients of the real and quadrature signals), a selective filter b, a sign analyzer 7, a pulse edge extracting unit 8, memory element 9 (trigger), transform scale check element 10, null organ 11 (peak transformer), first switch 12 (fixed offset switch), threshold detector 13, delay unit 1, second switch 15 (roar switch RSA) key 16, a source 17 .etalonnogo voltage integrator 18 (scale integrating amplifier

The two terminals of the three-second winding rotor of the selsyn 1 are connected to the two ends of the primary winding of the transformer 2, its midpoint output is grounded and connected to one of the capacitance terminals of the phase-shifting circuit, the second output of the capacitor 3 is connected to one output of the secondary winding of the transformer 2 circuit 4 is connected with the third output winding of the rosin of the selsyn 1, the other the output of the secondary winding of the transformer 2 is connected to one output of the potentiometer 5 of the alignment of the coefficients of the real and quadrature signal als, and its other terminal connected to the first terminal of the secondary winding of the transformer 2, the movable contact of the potentiometer 5 is connected to the input

. selective filter 6 output connected to the input of the analyzer 7 character, the output of which through the block 8 under the buggy to one input of the trigger 9 and to the first element 10 of the test

. the conversion scale, the mains voltage of the marsilyn 1 is fed through a resistor to the T1 primary winding of the peak transformer 11, the secondary secondary point of which is grounded, the secondary ends of the peak transformer 11 through the Fixed bias switch 12 to the input of the threshold detector 13, to the output of the connected input of the block 14 delay, the output of which is connected to the second input of the trigger 9 and the second element 10 of the conversion scale check, both outputs of the trigger 9 through the switch 15 of the reverse with are connected to the control input of the switch 16, the signal input of which is connected to the output of the source 17 of the reference locus, and the output of the switch 16 is connected to a large-scale integrating amplifier 18.

The device operates as follows.

Signal inputs of the device. give signals of the 3 section winding of the selsyn 1 or balanced synchronous selsyn transmission. With the help of a transformer 2 with a diversion of the primary point of the primary winding, these signals are brought to the form of two signals perpendicular to each other in the directions. By a signal from one direction, a phase shift is introduced. The resistance of the phase-shifting circuit 4 is chosen much higher than the capacitance at the frequency of the power supply network of the capacity of the phase-shifting circuit. In this case, the phase shift of this signal at the frequency of the mains supply is close to the EO. The second signal is transmitted by the transformer 2. The transmission coefficients of the integrating circuit signal and the signal transmitted without a phase shift by the transformer are equalized by potentiometer 5.

Let the mains voltage and A-s ni-Jt. The input voltage of the α-out-of-shear circuit U is A-costp-sinco t. The voltage at the input of the transformer and A6in4 Sinwt, 0 where and is the voltage;

f is the angular position of the selsyn rotor; .

(x) is the mains frequency;

t is time;

And - coefficients.

At the output of the phase-shifting circuit, one vector voltage is equal to A-costp-costo t, and the second vector voltage on the potentiometer of the equalization of the coefficients is equal to U2 (j smcJ t. The addition of these vector voltages is performed by connecting the sources of these voltages in series. B The result of the addition of both vectors with equalized coefficients is the third vector of the form 65 A-cos (4-wt) with a constant amplitude and phase shift determined by the angular position of the selsyn rotor, 1 ..

According to the actual component (without phase shift), interference of higher harmonics caused by the stressed magnetic core mode passes

selsynsin l, the quadrature component of this interference is suppressed by the phase-shifting circuit. The real-time vector re-emitting signal includes distortions of higher harmonics transmitted by the real component, moving in phase depending on the position of the selsyn rotor. These distortions are aligned by the selective filter 6. The filtered signal of the received voltage with a phase shift in the supply mains frequency determined by the angular position of the rosin rotor is represented by the logical signal of the analyzer 7 characters, one of the edges of this signal is output by the block 8 and fed to the trigger input 9 The trigger records by changing its state the passage of this pulse, for example, by resetting it to the zero state. The signal of the reference phase of the supply network through the peak transformer 11, which generates a pulse when the sign of the network voltage changes, is fed to the input of the threshold detector 13, which selects a pulse of one sign, which is held by the delay unit 14 with an adjustable time delay setting. The delay time is set by the installation with the possibility of its variation within the half of the period of the mains supply, the overlap of the second half of the period of the mains supply is achieved by means of the fixed offset switch 12. The delayed pulse arrives at the other input of the trigger 9 and cocks it into a state, for example, in which it is before the arrival of a pulse of a sign change. The trigger output pulses with the network frequency are fed to the control switch 16, which for the trigger pulse time within the supply period, proportional to the angular position of the selsyn rotor within the revolution, connects the source 17 to the input of the integrating scale amplifier 18, which averages these pulses. The transmission coefficient of this block is defined by the ratio of the resistance values of the resistors at the input and in the feedback circuit, so that changing the position tp of the selsyn rotor within О + 2 taps a linear change in the output signal within the standard range. The device also works in the reversed mode, when for a zero of reference, the time of changing the sign of the resultant module with a variable phase shift and the mismatch of the network phase is read out relative to it. In this case, the switch 15 of the reverse is moved to another position, switching the direct output of the trigger 9 to the inverse one.

With real measurements, it is not always possible to simulate the initial or final value of the range; in this case, upon termination. the position of the reverse switch 15 is determined, and then the output voltage of the device is set by the bias switch 12 and the delay unit 14 is installed according to its current value of the angular position of the rural rotor of the synchronously following systems. Scale check elements 10, connected to the inputs of the trigger 9 or a special installation of its input, em, Oh, and allow 5 tipovavat

5 the beginning and end of the measurement range. The beginning of the range is characterized by a zero pulse fill factor of trigger 9, and the end is a single value.

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The economic efficiency of using the proposed device is determined by the technical advantages indicated by it.

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Claims (2)

1. Author's certificate of the USSR 222201 / c. 08 C 19/02, 1966. 2. USSR author's certificate  475647, C. 08 08/04, 1975. (prototype). T5 tJ tf