SU601729A1 - Method of conversion of shaft angular position into code - Google Patents

Description

additionally formed voltages: and transform into voltages shifted in phase, determine the phase shift of these corpora n and convert it into a code of dololitelnogo exact reading of the increment of the angle from the beginning of the width with discrete discreteness.

This method allows to significantly reduce the discrete phase iii to increase the accuracy of the non-uniform angle in the code.

The essence of the proposed method is based on the example of a single-phase phase rotation.

If the angle of rotation is transformed into two nonrelains:) 1x of voltage, modulated and acted as Lt. C-11, epochek), it can be seen that -when changing the smaller of the modular but amplitude | 1 Apr zhky from zero in both directions to the same modulus with the larger of the modulated but the amplitude of the phase, modulated on -phase value of the compared signal catch, but only on their ratio.

If two sigils of electrical current are detected in art, one of which has a constant a-max value, and the other changes: then from zero in both directions to coincide “- but an olodule with a signal with a constant-amp.implentudy , and n. to transform both of these ogls in the shift, in phase two, on the spine,

the magnitude of the phase shift will also be ±. .

In this comparison, compared with the conversion of sinusoidal signals, there appeared blunt nonocularity caused by the replacement of the larger amplitude of the amplitudes of the linear level and its linearization with the smaller of the modulated but amplitude of the voltages.

If the AMNitness of the generated signals corresponds to the increment of the smallest voltage, which causes a change in the output code by one, then the conversion of the focus of the generated signals into a phase shift further B will significantly increase the ip resolution of the carbon into the code. At the same time, the maximum value of the nonlinearity error will be less than the new significantly reduced input quantity, which 3 generally improves the conversion accuracy.

The drawing shows a structural electrical circuit of one of the above options. TOV preobrazovatel who can implement the proposed method. The transform of the corner angle into the code contains a sinusoidal 1 unit connected to the converter 2 angles of one or several alternating voltages modulated by an amplitude in the func. rotation angle. Converter 2 is connected to converter 5 modulated by

the amplitude of the unavoidable stresses in the CODE and to the forts: the world leader 4 is the smallest modulated; s in amplitude of the stresses and the sign of the production | With the bottom of this voltage with an increase in the angle of 1 °; 50 °. The output of the block / through y; 1p: avlimy; OtetsTsi.ometr 5. is connected to the sum of the 6 non-temporal signals, the other of which is soy ;; non s.yyvodom f.pM1Ivater 4. The output of the adder 6 is connected to the same input block 7

to convert the amnlt-modulated. signals in the phase-modulated signals and through the key 8 to the controller –input :: wallUiOMeTpa 5. The power supply unit / through a divider 9, the current input of which is connected to the output of the imaging device 4, but connected to another G; the output of which is connected to the converter / O phase shift in the code. Controller in: 7yards of key 5 and controller 4 Soed-inens with source output 7 / com.ndy

about measuring the angle with non-linear: yu. discrete.

The transducer works in the following way.

The filing unit 1 produces a sinusoidal c-ph-ial, which is fed to the excitation winding-inverter-2, and the output of which produces signals modulated according to the amplitude-amplitude function as a function of the angle of rotation. Transducer 2 is set to be a linear potentiometer, sine-cosine sensor, agricultural; 1, etc. In transducer 3, a code is formed from amplitude-modulated signal-to. The transformer 3 can be performed on the basis of the non-direct conversion of amnlects to a code with an intermediate conversion to a phase shift.

Shaper 4 continuously detects the smaller absolute value of the amplitude of the input signal that goes to the MiaTOp 6 sum. At the same time, the Shaper 4 of the input signals gives the sign of the DROID of the selected signal for positive rotational voltage. dny

shaft (increase angle of rotation). In this case, each segment of the selector signal f 4 will uniquely correspond to a certain sign of the derivative, regardless of the direction of rotation of the input wave.

From the power supply unit 1, through the controlled Potentiometer 5 to the second I / O of the adder 6, a signal is received that is equal in absolute value to the output signal of the driver 4, but opposite to it in phase. As a result, the OUT1 signal of the totalizer 6 is zero.

When the angle of rotation of the converter changes at the output of the adder 6, an imbalance signal appears, which, by operating the public key 8 on potentiometer 5, regulates

output signal of potentiometer 5, returning the system to a balanced state.

The divider 9 forms from the output signal of the power supply unit 1 a variable-voltage with a constant Amplitude. The phase of the output voltage of the divider 9 OR coincides with the phase 5 of the output voltage of the unit / with a positive EL derivative; w. srnmrozatelnym 4 .vrezheniya or nrotkvollolla: tpH negative proZzdnoy. If linear transducer has been selected as transducer 2. A linear meter has been selected, then the sign of the phase is not; If, 3 as the converter 2, the sine-cone sensor is selected, then the product is positive s 1, 6, 7, 8 octaates and is negative at 2, 3, 4, 5 octants. For the selsyns, the sign of the derivative of the extracted signal is indicated through a distance of 60 °. Thus, in the absence of a command from source 11, the output signals of block 7 are not phase-shifted, and “one converter W does not change in magnitude. With the command from the source // about the beginning of measurements with reduced discreteness, the key 8 is closed, and the signal from the output of potentiometer 5 remains. All the time measured is equal in amplitude, and opposite in phase to the output signal of the former 4 at the moment the arrival of the command from the source 11. As a result, on the output of the cumulator 5. a variable voltage is produced, which is just the same as the smallest of the voltages with the highest amplitude starting from. from zero at the beginning of measurements with reduced discreteness. At the same time, the command from the source 11 blocks for possible idle times with reduced discreteness possible switchings in the shaper 4, associated with the allocation of a smaller absolute value and the amplitude of the signal and the sign of its derivative. From the output of the divider 9 to the other input of the block 7, an alternating current voltage with a minimum amplitude and a certain phase is supplied. As a result, in the measurement mode with reduced discreteness, the output signals of the block 7 are shifted relative to each other in phase in accordance with the change in the angle of rotation of the input shaft and the angle transducer to the code. In converter 10, the phase shift is converted to an angle increment code from the beginning of the measurement with a reduced resolution. With this increase in the angle of rotation, an increase in the output code of the inverter 10 corresponds. Technical advantage of the proposed angle conversion method (B code compared to 60 with the known methods of a similar design enp is expressed in ionic discrete angle conversion, which was confirmed by any costs and Experimental studies of the angle-to-code converter, the layout of which was made in accordance with the structural scheme presented in the drawing. This method is due to the above mentioned. and its technical advantages. Fo rm a lu inventions Method of converting the angle of rotation of the shaft into a code based on converting the angle into one or several alternating voltages modulated in amplitude as a function of the angle of rotation per turn, characterized by the fact that, in order to reduce the discreteness of conversion, it is additionally formed. Two variables form two voltages, the amplitude of one of which is constant and equal to the maximum possible amplitude increment from modulated on a-mplitud of charges in the range of measurements of the angle with reduced discreteness, and its phase corresponds to the derivative of the smallest modulated by the amplitude of the voltage with increasing angle of rotation, at the beginning of the measurements, with a discrete discreteness, the additionally generated voltages are transformed into voltages, but shifted in phase, the phase shifts of these voltages are determined, and they are transformed into an additional code telny exact reading of the increment of the angle from the beginning of the Measurement with reduced discreteness. Sources of information taken into account in the examination: 1. E. E. Gitis. Information converters for electronic digital computing devices, Energia, 1970. p. 256-293 2. US patent number 3188627, cl. 340-347, 08.06.63. 3. US patent number 3505669, cl. 340-347, 07.04.70.