SU601708A1 - Functional shaft angular position-to-voltage converter - Google Patents

Description

one

The invention relates to automation and measurement technology, in particular, to devices for converting the angle of rotation of the shaft to voltage, and can be used for automatic control and measurement of physical quantities that are functionally related to angular displacement, for example, to measure and control boom lift the crane.

A known converter for converting a shaft angle to a voltage comprising a rotary transformer, for example, a ferrodynamic converter, the output of which is linearly related to the angle of rotation of its output shaft | l /.

However, the field of application of this device is limited to direct measurements of angles and physical quantities linearly related to the angular displacement of the shaft.

The closest technical solution to this invention is a converter, which, like this converter, contains a block for algebraic summation and a series-connected rotary transformer, a stator winding,

which is connected to the power supply output of the stabilized variable voltage Hia, and the rotor shaft is the mechanical input of the device, and the normalizing AC-to-constant converter, the output of which is the output of the device 2.

However, this converter has limited application, due to the limited class of functional dependencies formed by it. In particular, as is known, the static output characteristics of sine-cosine rotary transformers, depending on the windings included, are described only by sine cosine and linear dependencies. In addition, this converter is complex and has a narrow range of adjustment of the parameters of static conversion characteristics, which is due to the implementation of these adjustments by changing the design parameters of the rotary transformer, for example, by changing the relative position of the magnetic shunt, which changes the configuration and intensity of the magnetic field in the rotary transformer. The aim of the invention is to expand the scope of application. To do this, a scale unit, connected input to the output of the normalizing AC-DC converter, and the output to the first input of the algebraic summing unit, the second input and output of which are connected to the feedback output and the control input of the stabilized alternating voltage, in addition, The source is stabilized by Hot D ac, voltage is made in the input of the series-connected voltage source, Equation block, connected by another input to the control input of the stabilizer variable voltage, the error amplifier and the regulating element, the output of which is connected to the inverter input: DC to AC voltage, the output of which is the power output of the stabilized alternating voltage source and the input of the back-link attenuator, the output of which is a feedback output of a stabilized alternating voltage source. FIG. 1 shows a structural electrical circuit converter; FIG. 2 static characteristics of the transformer The functional voltage converter contains a rotary transformer 1, a normalizing converter of alternating voltage to constant 2, a scale unit 3, a unit for algebraic summing 4, and a source of stabilized alternating voltage 5. The source of stabilized alternating voltage 5 contains a block for comparison, not 6, the error amplifier 7, the regulating element 8, the feedback attenuator 9, the DC / DC converter and the source reference voltage 11. The output of transformer 1 is connected to the input of a normalizing variable voltage converter into a constant 2, the output of which is connected to the unit of the scale unit 3. The output of the scale unit 3 is connected to one of the inputs of the block for algebraic-konJ summation 4, to another input which is connected to the output of the attenuator feedback 9 stabilized source of alternating voltage 5. The output of block 4 is connected to the input of block 6, to the other input of which is connected the source of the reference voltage 11. The output of block 6 is connected to input A mismatch amplifier 7, connected by its output to the control input of the regulating element 8, to the other input of which is fed an unstabilized DC voltage applied to the feedback attenuator 9 and the AC voltage to AC converter. The mechanical input signal to the device is fed to the input of the gate transformer 1 in the form of the angle of rotation of the shaft of its rotor F. The output direction of the device is b. functionally connected; With angle H, the normalizing voltage is removed from the output & variable voltage generator into constant 2,. The Converter operates as follows. In the initial position of the angle of rotation of the rotor shaft of the transformer 1, the amplitude of the variable emf at its output is zero and, accordingly, the output voltage of the device tl.g and the output voltage of the scale unit 3 are zero. The comparison voltage at the input of the block 6 is equal in this case to the output voltage feedback attenuator 9 proportional to the supply voltage of the converter 10. If the supply voltage of the converter 1O deviates from the set value determined by the condition} CT (1) is the reference voltage of the source –voltage Comparison at the input of block 6, equal in this case to the output voltage of the feedback attenuator 9UQ |, To that appears at the output of block 6, the error voltage is amplified by the error amplifier 7 and the regulating element 8 changes its parameters so that its output voltage will restore the previous value. As a result, the power supply voltage of the converter Yu remains constant, and. Naturally, the constant amplitude and frequency of power supply of transformer 1. When the angle of rotation of the rotor shaft of transformer 1 deviates from the initial position at a certain angle, a variable EMF appears at its output and, accordingly, a voltage appears at the input of unit 4. This voltage, Adding to the output voltage of the feedback attenuator 9, causes a change in the comparison voltage at the input of the block 6. The appearance of the error signal at the input of the amplifier 7 is amplified, and the regulating element B changes the parameters novelty.

U) U, - ol., T2)

Have

- amplitude of the output voltage of the rotary transformer j;

a is a coefficient proportional to, and a is the voltage amplitude of the power source of the rotary transformer; - angle of rotation of the shaft ro mountain of the rotary transformer. But, since now, ds) where Up, the output voltage of the feedback attenuator 9, tlj is the output voltage of the scale unit 3,. This output voltage of the regulating element 8 will change by an amount corresponding to the subsequent voltage change. This will lead to a change in the amplitude of the supply voltage of the transformer 1 and, accordingly, to a change in the era of sensitivity. As a result, the sensitivity of transformer 1 turns out to be a function of its output voltage, which corresponds to a non-linear relationship between the output voltage of the converter and its input signal. The static transformation characteristic can be obtained from the joint solution of expressions (1) and (2), taking into account expression (3) and the following CTaTH4ec5kHX characteristics of feedback attenuator 9, normalizing converter 2, scale unit 3 and 1Q converter: ".-Ur: Y . Where, I went, and, and, and, and — the output voltage of the feedback attenuator 9, all. converter, scale unit 3, converter U, transformer 1- and regulating element 8, respectively: Ke ,, Kj ,, R ,, K are the transfer coefficients of the corresponding components of the device (see Fig. 1). The production of the corresponding substitutions. in expressions (1) and (2) and resolving the obtained / expressions with respect to the first voltage of the converter Up, we obtain the following expression for the static characteristic of the transformation:

.A M

in 1 ± HF (4)

 i "Jbl lnlHo

K (3 (

to 2L L Jin ± i.

Tw

Claims (2)

1. Authors svdedelstvo USSR № 446096, cl. BGO8 from 19/46, 1972. 2. USSR author's certificate number 424011, cl. G01 D5 / 12, 1972. Hugo turning Agde5 Figure 2