SU537374A1 - Device for controlling the operation of angle-code converters - Google Patents

Description

one

The device relates to the field of automation and computer technology and is intended to verify the accuracy of the operation of angle-code converters.

A device for checking the accuracy of angle-code converters is known, which allows determining the instrumental errors of angle-code converters with code scales, the results of measuring the errors are expressed as a function of the angle of rotation of the input shaft of the converter and are subjected to scale conversion. However, this device has reduced accuracy and reliability due to the use of a precision downshift, its gearbox, the error of which is fully included in the measurement result, a tape-carrying mechanism with a tape and an information recording unit, and also requires the need for subsequent information processing.

A device for checking angle-code converters is known, which makes it possible to determine the number of the error code boundary (measured from the reference code) and fix the error value using a complex algorithm based on comparing the current value of the converter code with the theoretical code value of the coordinates of the allowable zone.

The functional circuit of such a device includes a converter, a distributor, a switch, a motor with a synchronization circuit, a code converter, a register of the reference combinations, two coincidence circuits, two triggers, a switch, a “Restriction” element, transition control circuits of the first n controlled bits, two valves, counter and register of coordinates of an admissible zone.

Unlike these technical solutions, the angle-code accuracy control device allows you to determine the law of distribution of the error probabilities of reproduction of all quantization levels using the simplest and most reliable principle of determining the error by measuring the quanta of the coded angle during rotation of the code scale of the angle converter code. For this, the converter shaft is rotated at a constant speed, signals are formed at the reference and real quanta boundaries with the help of special devices, and then the error is determined by the time interval of the meledu signals.

Based on the analysis of the known devices, the last device is selected as a prototype of the proposed device to control the accuracy of the angle code converters, the functional construction of which provides the simplest implementation of the angle-code converter error determination algorithm. This device contains a code-matching unit, a stable speed drive connected to a stable frequency generator, and a generator to one of the valve inputs connected to a counter, a time interval generator, the output of which is connected to another valve input.

However, the described device is characterized by lower accuracy due to the presence of an error due to misalignment of the converter under study and a stable speed drive and a kinematic connection between them (instability of the friction moment in the supports of the converter under study introduces additional error in the operation of the stable speed drive) code in static mode. Testing transducers in a wide dynamic range (different speeds of the shaft of the transducer under investigation) causes considerable technical difficulties due to the difficulty of building a stable speed drive for several discrete values.

Since, in practice, the most convenient form of information representation is just a graph of the error of the converter being investigated versus the angle of rotation of the shaft of the latter, determining the law of error probability distribution complicates the circuit, which further reduces the reliability of the device and limits the use of the latter in automation systems.

The purpose of the invention is to improve the accuracy of control and expand the functionality of the device controlling the accuracy of angle-code converters.

This is achieved by inserting a combination indicator, zero position sensor, comparison unit, additional drive, illuminator, separator prism, and two mirrors into the device. The illuminator through the separation prism and the first mirror, mounted on a stable speed drive shaft, is optically connected to a second mirror, mounted on the rotor of the transducer under test, which is connected to an auxiliary drive. The output of the coincidence indicator is connected to the first input of the time slot generator and the first input of the code reading unit, the output of the read block is connected to the first input of the comparison unit, the second input of which is connected to the counter output, the third one is combined with the second input of the time interval former, the second input of the counter and connected to zero position sensor output, which is connected to a stable speed drive.

The drawing shows a block diagram of a device for controlling the operation of angle-code converters.

It contains the converter 1 under study, stable speed drive 2 with sensor 3 zero positions, stable frequency generator 4, additional drive 5 converter, illuminator 6, separation prism 7, mirrors 8, 9, coincidence indicator 10, code reading unit 11, driver 12 temporary intervals, the valve 13, the counter 14 and the block 15 of the comparison.

The device works in the following way.

Before the start of the measurement, the readings from the zero position sensor 3, the coincidence indicator 10 and the transducer 1 are combined (the count is taken from the zero code). At the same time, the luminous flux from the illuminator 6 through the prism 7 enters the mirror 8, reflects on the mirror 9, again reflects on the mirror 8, and then passes to the prism 7 and then to the input of the indicator 10. The counter 14 is set to the zero state.

When pulses are delivered from the generator 4, the drive shaft 2 is rotated with a mirror 8 fixed on it. The rotor of the converter 1 under study rotates by the drive 5. When the rotational angles of the converter rotor are equal to the stable speed shaft 2, the indicator 10 generates a signal In block 11, the current value of the converter code is fixed. The driver 12 forms the time interval between the signals from the sensor 3 of the indicator 10, which through the valve 13 is filled with pulses from the generator 4. The number of pulses passed through the "temporary gate" is counted by the counter 14. At the end of the temporary material, block 15 compares the actual code value recorded in readout unit 11, with a reference value in counter 14, and outputs the result for registration, and the counter is reset.

In this way, the error of the converter is determined at different angles of rotation of the rotor, and the number of monitored leakages per rotor rotation is determined by the ratio of the speeds of the drive at a stable speed and the drive of the converter. The device provides control of the accuracy of angle-code converters in static and dynamic modes of operation, while the wide range of rotational speeds of the converter's rotor does not cause technical difficulties due to the lack of stability requirements of the latter, and the optical connection of the converter under study with a stable speed drive excludes the error from misalignment of their mutual position.

Claims (1)

Invention Formula A device for monitoring the operation of angle-code converters containing a readout unit, a stable speed drive connected to a stable frequency generator, which is connected to one of the valve inputs connected to a counter, a time interval generator, the output of which is connected to another valve input, that, in order to increase the accuracy of control and expansion of functionality, a coincidence indicator, a zero position sensor, a comparison unit, an additional drive, are introduced into the device, illuminate Either a separating prism and two mirrors, the illuminator through the separating prism and the first mirror mounted on the stable speed drive shaft are optically connected to the second mirror mounted on the rotor of the tested converter, which is connected to the auxiliary drive, the output of the coincidence indicator is connected to the first input of the former time intervals and the first input of the code reading unit, the output of which is connected to the first input of the block comparison, the second input of which is connected to the output of the counter, and the third is combined with the second input of the time interval generator, the second input of the counter and connected to the output of the zero position sensor, which is connected to the stable speed drive.