SU1091202A1 - Shaft turn angle encoder - Google Patents

Abstract

SHAFT ANGLE CONVERTER A CODE containing a power source connected to the input of the phase shifter, the output of which is connected to the information input of the phase shifting circuit, the first and second comparators, the first inputs of which are connected to the common bus, the output to the inputs of the time interval-to-code conversion unit, and the second input of the first comparator is connected to the output of the phase-shifting circuit, which is equivalent to so that, in order to increase its resolution, a supervisor and a generator were introduced into it, and the phase shifter was controlled, the generator output was connected to the phase shifting control input, the power supply EXIT was connected to the second input of the second comparator, the outputs of the conversion unit (L the time interval in the code is connected to the inputs of the adder; o

Description

The invention relates to a measurement technique, namely to devices of discrete sensors of angle, and can be used in an exact instrument structure. A known angle-of-turn converter, a shaft into a code containing a sine-cosine rotational transformer (SCWT), the output of which is connected via an amplifier to the first input of a phase-sensitive rectifier, the output of which is connected to the control inputs of the first and second keys of the variable frequency generator, the output of which is connected to the inputs of the first and second keys, the output of which is connected to the inputs of the reversible counter, the output of which is connected to the input of the function code-voltage converter, the outputs of which connect are not with sine and cosine dbmotkami squat tn. The disadvantage of such a converter is the low resolution of the code-voltage, which is determined by the quantum of the functional converter voltage. Closest to the prdagayayamu is a shaft angle converter into a code containing power sources, connected to the input of the phase shifter, the outputs of which are connected through a phase-shifting circuit to the first inputs of the comparators, the second inputs of which are connected to the common bus, and the VEs are connected to the inputs of the time interval conversion unit to the C2 code. A disadvantage of the known transducer is; low resolution, limiting the resolution of the time interval to code conversion unit. The purpose of the invention is to increase the resolution of the converters of the shaft rotation angle into the code. The goal is achieved by the fact that in the converter of the angle of rotation of the shaft V-code containing a power source connected to the input of the phase rotation, the output of which is soy, is connected to the information input of the phase-shifting circuit, the first and second comparators, the first inputs of which are connected to the common ground terminal .tsi - with the inputs of the time interval conversion unit into the code, and the second input of the first comparator is connected to the output of the phase-shifting circuit, an adder and a generator are entered, and phase-shifted and the circuit is controlled, the generator output is connected to the control the phase shift circuit input, the output of the power source is connected to the second input of the second comparator, the outputs of the time interval to code conversion unit are connected to the inputs of the adder. Fig 1 shows a structural diagram of the converter of the angle of rotation of the shaft into the code; in fig. 2 shows timing diagrams explaining its operation. The shaft angle-to-turn converter contains the phase shifter 1, the controlled phase-shifting circuit 2, the generator 3, the comparators 4 and 5, the block 6 for converting the time interval to the code, the adder 7 and the power source 8. FIG. Figure 2 shows the graphs of the phase shift of a sinusoidal voltage from the output of the phase-shifting circuit 2 relative to the reference voltage 5J at various values of the measured angle Rf (position A, B, C); lines of adjacent quantization levels of a time interval conversion unit 6 into code (i) and (i + 1); times 1, 2, the reading of the codes by the block 6 and the summation of these codes in the adder 7 during the period TQ of the control periodic signal; as well as the value D of the unit of the low-order unit of the block 6 that converts the time interval to the code. The converter works as follows. The generator 3 generates periodic signals of a triangular shape,, supply to the control input of the phase-shifting circuit 2, under the action of which it provides an additional phase shift of the sinusoidal voltage from the output of the phase shifter 1 at an angle of 5 equal to the unit least significant unit 6 with a period during which occurs 2 conversion cycles in this block. During the period TQ of the control signal, 2 angle codes measured with discreteness and the sum of which the adder accumulates are received at block 6 to the input of adder 7 from block 6. Since, due to the presence of a periodic phase shift, the voltage phase at the first input of the comparator 5 changes continuously, during part of the period the code (I) is issued (FIGS. 2, 3, position B, sections a b, d - e) and for the remainder of the period the code (i + 1) (Fig. 2, position B, sections b-c, c-d), the value of the sum of the codes (i) and (i + l) for the period Td is determined by the phase shift - proportional to the measured angle. The value of the sum of codes with discreteness l has by 01 significant bits greater than the code at the output of block 6. Consider the resulting sum as an estimate of the measured angle, find that by applying an additional periodic phase shift to the main phase shift and summing the codes for the period measured with discreteness d, less discreteness and blocks of 6, i.e. L J / 2 Obtaining dyMNOJ codes for the period T - does not make sense (in terms of reducing the error from discreteness) 024 without introducing an additional periodic phase shift, since in this case the same codes are summed over the entire period and the sum simply the block code 6 is increased by 2 times, and m additional significant bits contain zeros. In addition, the averaging of codes over a period makes it possible to reduce the noise component in the code of block 6, since noise has a zero mean value. Improving the accuracy of angle measurement using the proposed transducer expands its area of use, replacing the angle measurement with the help of high-precision optical tools (theodolites) serviced by the operator in a number of cases and allows you to automate the process of high-precision angle measurement.

/ i //

V.JJ .y

..

year

Claims (1)

A SHAFT ANGLE CONVERTER TO CODE, containing a power source connected to the input of the phase shifter, the output of which is connected to the information input of the phase-shifting circuit, the first and second comparators, the first inputs of which are connected to the common bus, the outputs are with the inputs of the time interval to code conversion unit, and the second input of the first comparator is connected to the output of the phase-shifting circuit, which differs. in order to increase its resolution, an adder and a generator are introduced into it, and the phase-shifting circuit is made controllable, the output of the generator is connected to the control input of the phase-shifting circuit, the output of the power source is connected to the second input of the second comparator, the outputs of the time interval conversion unit are the code is connected to the inputs of the adder. > f 109