SU1401604A1 - Shaft angle-to-digital converter - Google Patents

Abstract

The invention relates to automation and computing devices, in particular, to means of converting the angle of rotation of the shaft into a code used in the control of angle converters. The aim of the invention is to increase the reliability and simplify the adjustment of the converter. To do this, into the converter of the angle of rotation of the shaft into a code containing an electromechanical scale 2, comparators 4, 5, element AND-NOT 6, element 8 and 1K trigger 10, entering filter 3, driver 7 pulses and one} vibrator 9. Set target this is achieved by using the two thresholds formed by the comparators 4, 5, to extract the maximum and minimum values of the output voltage of the electromechanical scale 2 and at the moment of reaching the minimum voltage the output signal is generated. 3 il. about

Description

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The invention relates to automation and computing devices, 3 in particular, to means of converting the angle of rotation of the shaft into a code, which is used when monitoring angle converters.

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

FIG. 1 shows the structural diagram of the converter of the angle of rotation of the shaft into the code; in fig. 2 and 3 - 5 diagrams of diagrams, which explain the operation of the converter.

The converter of the angle of rotation of the shaft into the code contains a trigger latch I, electromechanical scale 2, filter 3, comparators 4 and 5, C: 7 AND-NE 6, shaper 7 pulses, element 8, and the trigger latch is designed as a single vibrator 9 and 1K -trigger 10.

In addition, the output signal 11 of the electromechanical scale 2 is shown,

the output signal 12 of the filter 3 (FIG. 2) is the output signal 13 of the filter 3, the output signal 14 of the comparator 5, the output signal of the pulse driver 7, the output signal 16 of the AND-NOT element 6, the output signal 17 of the AND 8 element and the output signal 18 trigger latch 1 (Fig. 3).

The converter works in the following way.

The input and output signals of the electromechanical scale 2 are sinusoidal, but the output signal is modulated by the angular coordinate (the case of acgplate modulation). Filter 3 is necessary to separate the main harmonic from the output signal of the electromechanical scale 2, which has a harmonic composition. In addition, the filter 3 amplifies the output signal of the electromechanical scale 2 to the level required for further processing. This, in the vicinity of the modulation moments, the output signal of the electromechanical scale 2 increases in proportion to the gain factor of the filter 3. At the same time, the speed will change: and the output amplitude The signal of the filter 3, as compared with the rate of change of the output signal of the electromechanical scale 2, also increases proportionally to the gain of the filter 3. Output signals ly H and 12

The electromechanical 2 and filter 3, respectively, are shown in FIG. At the outputs of the first and second comparators 4 and 5, high-level signals are formed under the condition that the output signal 12 of the filter 3 exceeds the levels of the reference voltages U 4 and U 5 of the corresponding coders 4 and 5. The level of the reference voltage U 5 of the comparator 5 has a positive polarity and it exceeds the residual voltage of the filter 3 caused by the residual voltage of the electromechanical scale 2. The level of the reference voltage U4 of the comparator 4 exceeds the level of the reference voltage U 5 of the comparator 5, but does not exceed the maximum output value signal 12 of filter 3. The output signal 13 of filter 3 and the levels of the reference voltages U 4 and U 5 of the first and second comparators 4 and 5 are shown at the output in FIG. 3

A trigger latch is used to form one pulse of positive polarity at the output of the converter when forming a series of impulses at a clock input of a 1K trigger 10. This is done as follows: when forming at a clock input of a 1K trigger of a 0 series

pulses of positive polarity, 1K trigger 10 is tilted so that low-level signals are generated at its information inputs. The tilt 1K trigger 10 corresponds to the eye moment} {the first impulse of positive polarity, formed on the clock input of the 1K-trigger 10, since the 1K-trigger 10 can trigger only when the signal on its clock input changes from high to low All of the following pulses, formed on the clock input of the 1K flip-flop 10, do not change its state. When the signal at the inverse output of the iK-flip-flop 10 from a high level to the low one changes, the one-oscillator 9 generates at the output 1-: positive-polarity pulse having a fixed duration.

Thus, at the output of the sampler 9, only one pulse of positive polarity is formed, shown in FIG. 3. The trigger hook J is prepared for operation, after the formation of its initial installation, its pulse is set at the input: first polarity, while at the same time

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The inputs of the IC trigger 10 high-level signals are generated.

A positive polarity pulse formed by comparator 4 prepares the trigger latch 1 for operation. After each change of the signal of the comparator 5 from a low level to a high form, the pulse generator 7 generates a positive polarity pulse. The latter works in such a way that the length of time between the moments of the formation of the leading edge of the pulse of the comparator 5 and the trailing edge of the pulse of the former of the pulse generator 7 is constant and equal to C. If the pulse duration of a positive polarity, formed by the comparator 5, exceeds the duration C, the input signals of the element And 8 are inverse to each other. Consequently, the output of the element And 8 is supported by a low level signal. If the pulse duration is positive

Trigger latches 1 at the output of the converter are also formed of a polar-positive region (Fig. 3),

Claims (1)

Invention Formula Q ig 0 The converter of the angle of rotation of the shaft into a code containing an electromechanical scale, the first ko mapatop, the input of which is connected to the input of the second comparator, and the output - with the first input of the AND-NO element, which is connected to the first input of the element And, the output of which is connected to the clock input IK- a trigger, the output of which is connected to the information inputs of the iK-trigger, characterized in that, in order to increase the reliability and simplify the tuning of the converter, a filter, a pulse shaper and a one-shot are entered into it, the output of the electromechanical scale connected through a filter polarity generated by the comparator - 25 - the input of the first comparator, the output torus 5, does not exceed 1, at the output of the element And 8, positive polarity pulses are generated, arriving at the clock input of the trigger latch 1. The output signals of the comparator 5, the pulse former 7, the AND-HE element 6 and the And 8 element are shown in FIG. 3. As a result of actuation R The second comparator is connected to the input of the initial installation of the IK-flip-flop, the output of which is connected to the input of a single vibrator, the output of which is the output of the converter, the output of the first comparator is connected via a driver, pulses to the second inputs of the I-PE element and the I. Ui