SU676869A1 - Selsyn shaft angular position- to-dc voltage converter - Google Patents

Description

one

The invention relates to measurement and computing technology and automation and can find application in information measurement systems and technological process control systems when converting signals in single-phase agricultural transmissions containing information about the angular position to proportional DC voltage.

Signal converters for sine-cosine rotary transformers (CCWT) to DC voltage are known. For example, in analog computing environments, a tracking system is used, the actuator of which contains a tightly coupled mechSWT receiver and a potentiometer powered by DC voltage. In this case, the output potentiometer is removed from the potentiometer slider proportional to the angular position I.

The closest in technical essence to the proposed is a converter of the angle of rotation of the selsyn shaft into a linear direct current signal, comprising a selsyn sensor and a selsyn receiver, the excitation windings and output windings of which are respectively interconnected, and the excitation windings of the selsynov

with the input of one of the limiting amplifiers, the outputs of which are connected to the inputs of the switching unit, the output of which is connected to the input of the integrating unit, and phase-shifting multi-terminal 2 through the respective differentiating units. The accuracy of this converter is limited by the presence in the voltage induced in the selsin-receiver windings, harmonic components with a frequency different from the frequency of the mains supply.

The purpose of the proposed technical solution is to increase the accuracy of the converter.

This goal is achieved by the fact that in the converter the phase-shifting multi-terminal is performed on two capacitors and a transformer. The primary winding pins of this transformer are connected to the pins of two output windings of the selsins, the output of the third output winding of which is connected directly to one of the secondary windings of the phase-shifting multi-terminal transformer and through one of the capacitors to the midpoint of the primary winding of the phase-shifting multi-terminal transformer, in parallel with which another phase-shifter has one .

Another conclusion is the secondary winding of trans. the phase-shifting multipolar formatformer is connected to the input of another limiter amplifier.

The configuration of the circuit formed by the transformer primary winding and the capacitor connected in parallel to it, in resonance with the supply network, as well as the presence of a second capacitor connected between one of the ends of the secondary and midpoint of the primary winding, can be filtered from the voltage induced in the windings of the selsyn-receiver , harmonic components with a frequency different from the frequency of the mains supply. This provides increased accuracy of the converter.

The drawing shows the functional diagram of the Converter.

It contains a selsyn sensor 1, a selnsin receiver 2, a phase-shifting multi-terminal 3, consisting of transformer 4 and capacitors 5 and 6, amplifiers-limiters 7 and 8, differentiating units 9 and 10, switching unit 11, integrating unit 12. Transformer 4 has a primary 13 and the secondary 14 windings, and the selsyns the output windings 15 and the excitation windings 16.

The signals of the three-section output windings 15 of the resilient sensor 1 and the agricultural receiver 2 using a phase-shifting multi-terminal 3, which uses a transformer 4 with a removal from the midpoint of the primary winding 13, are in resonance with the mains using the parallel-connected winding of the capacitor 5, are projected onto two mutually perpendicular directions, sine and cosine. One of the directions introduces a phase shift of 90 ° using a capacitor 6, which, due to its integrating properties, filters out distortion of the selsyn signals.

In the other direction, filtration is carried out due to the resonant tuning of the primary winding 13 of the transformer 4. Voltage with a constant amplitude and phase determined by the angular position of the selsyn-sensor shaft 1 is applied from the output of the secondary winding 14 to the input of the limiting amplifier 7. The limiter 8; the voltage comes from the winding 16 of the excitation of the selsins.

The impulses of the limiting amplifiers 7 and 8, differentiated by means of differentiating units 9 and 10, trigger the switching unit II, for example, a trigger. The duty cycle of the pulses at the trigger output is determined by the phase shift of the signals at the outputs of the limiter silicate.

From the output of the integrating unit 12, in which quality can be used, for example, an integrating amplifier, a DC signal is removed, linearly

depending on the phase shift of the AC signals.

The presence of a phase-shifting multi-pole in the converter, made in the form of two capacitors and a transformer with a primary winding tuned to resonance with the supply mains, allows filtering out harmonic components with a frequency different from the supply mains frequency from the voltage induced in the windings of the selsyn-receiver. This improves the accuracy of the converter and provides more precise control of various technological processes in which iodine converters are used.

Claims (2)

1. USSR author's certificate AB 368634, cl. G 08 C 9/04, 1970. 2. US patent number 3375508, cl. 340-198, publ. 1968.