RU179243U1 - DEVICE FOR AUTOMATIC CONTROL OF DIGITAL ANGLE CONVERTER - Google Patents

Abstract

The invention relates to the field of measurement technology and can be used in goniometric systems that use rotary transformers as sensors of the input angular quantity, and digital angle converters (CPUs) as coding elements. The technical result of using the proposed utility model is to increase the accuracy of the control of the CPU and the entire goniometric path. The essence of the utility model is that a rotary transformer (VT) is additionally introduced into the control unit of the CPU containing the first, second, third and fourth keys and configured to transmit signals from the tested CPU to the computer and receive key management signals from the computer, the first , the second, third and fourth keys are made bipolar, the first inputs of the bipolar keys are interconnected and are inputs for connecting the excitation voltage of the tested CPU to the output, the second inputs of the bipolar keys are interconnected and are inputs for connecting to zero the excitation voltage of the tested CPU, the outputs of the first and second keys are connected respectively to the first and second terminals of the first stator winding VT, the outputs of the third and fourth keys are connected respectively to the first and second terminals of the second stator winding BT, the first and the second conclusions of the first rotor winding VT are outputs for connecting respectively to the sinus and inverse sinus inputs of the tested CPU, and the first and second conclusions of the second rotor bmotka BT are outputs for connection respectively to the cosine and inverse cosine inputs checked the CPU. 1 ill.

Description

The proposed utility model relates to the field of measurement technology and can be used in goniometric systems using a rotary transformer (VT) as input angular quantity sensors, and an angle-to-code converter that converts output sine-cosine signals of the form Usinα as a coding element sinωt and Ucosα sinωt, into a digital code (hereinafter referred to as the CPU - digital angle converter).

A control device for a CPU is known that contains a VT mounted on a precision goniometer device, usually on an optical dividing head (ODG) [1, p. 267]. Such a scheme is very cumbersome, expensive and cannot be used for automatic control of the CPU in the device and in serial factory production. In addition, in this scheme, both VT and ODG are measuring instruments subject to metrological verification and certification.

в дифференциальном методе, где δ - фазовая ошибка. К характеристикам, существенно влияющим на результат контроля, относятся и такие характеристики как напряжение смещения выходных усилителей эталонного формирователя, нелинейные искажения, пульсации и помехи от источников питания и другие характеристики.A device for automatic control of a CPU is known, which contains a precision reference shaper of sine-cosine voltages, the digital inputs of which are assigned from the electronic computer (computer) codes proportional to the values of sinα and cosα, where α is the angle of rotation of the shaft, and the analog input from the tested CPU the excitation voltage Usinωt arrives, where ω is the angular frequency and t is the time [2, p. 380]. These values are multiplied in precision digital-to-analog converters (DACs), as a result of which the output voltages of the reference driver become proportional to the voltages of the output windings of the rotating transformer, the shaft of which is rotated through an angle α (Usinα sinωt and Ucosα sinωt). In this scheme, the reference driver is a measuring instrument, for the metrological certification of which precise and expensive measuring equipment is required (precision AC voltmeter, phase meter, non-linear distortion coefficient meter). In addition, high metrological requirements are imposed on the reference shaper itself, since, for example, the error in the difference in the scale of the Usinα and Ucosα channels is either directly presented as a result of the conversion (for the differential phase method) or attenuates 2 times (for the direct phase method). The carrier phase shift occurring in the reference transducer, as well as its temporal and temperature stability, are also included in the conversion result (directly in the direct phase method and how

in the differential method, where δ is the phase error. The characteristics that significantly affect the control result include such characteristics as the bias voltage of the output amplifiers of the reference driver, nonlinear distortion, ripple and interference from power sources and other characteristics.

There is also known a device for monitoring the angle-code converter (digital angle converter - CPU), disclosed in the description of the utility model [3]. This device is the technical essence of the closest to the proposed and taken as a prototype.

The prototype device contains a test signal shaper and is configured to transmit signals from the tested CPU to an electronic computer (PC) and receive control signals from the test shaper from a computer. The test signal generator contains the first, second, third and fourth identical resistors, the first conclusions of which are interconnected and connected to the input of the test signal generator, which is the input for connecting the excitation voltage from the tested CPU, the first, second, third and fourth unipolar switches, the first the conclusions of which are connected to the second conclusions of the first, second, third and fourth resistors respectively, connected respectively to the first, second, third and fourth outputs form To test signals which are outputs shaper for connecting test signals respectively direct sine, inverse sine, cosine and inverse direct cosine inputs inspected CPU. The second conclusions of the first, second, third and fourth unipolar switches are connected to the bus of zero potential (zero voltage excitation). The outputs of the computer are connected to the control inputs of the single-pole keys, on which the computer generates control signals when generating test signals corresponding to the angles 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 ° and 315 °. At the same time, at the control input of the first key from the corresponding computer output, a key enable signal is generated when generating a test signal corresponding to angles 0 °, 180 °, 225 °, 270 °, 315 ° and a key disconnect signal is generated when generating a test signal corresponding to other angles, the control input of the second key from the corresponding computer output generates a key enable signal when generating a test signal corresponding to the angles 0 °, 45 °, 90 °, 135 ° and 180 ° and a key disable signal is generated when generating a test signal If the signal corresponds to other angles, the key enable signal is generated at the control input of the third key from the corresponding computer output when generating a test signal corresponding to the angles 90 °, 135 °, 180 °, 225 °, 270 ° and the key disconnect signal is generated when generating a test signal corresponding to other angles, at the control input of the fourth key from the corresponding computer output, a key-on signal is generated when a test signal is generated corresponding to angles 0 °, 45 °, 90 °, 270 °, 315 ° and a key-off signal is generated When forming a test signal corresponding to other corners. In this case, the CPU inputs are connected to the outputs of the test signal generator either through connectors or through relay elements

The known prototype device allows you to control the CPU at eight corner points, in increments of 45 °. In this case, to simulate sine-cosine voltages, the own excitation voltage Usinωt and its zero supply voltage (“0” supply voltage) are used, switching of which in different combinations to the inputs controlled by the CPU is carried out in the shaper of signal signals by computer commands, ensuring the formation of the necessary voltages.

In a known device, the control of a CPU having differential inputs is considered, that is, the differential amplifiers are included in the composition of this CPU.

The disadvantages of the known devices are insufficient reliability of control and incompleteness of control. This is due to the fact that when monitoring the CPU and during its normal operation, different switching elements are used, which further reduces the reliability of the goniometric path. Moreover, in the known device, the control does not cover a rotating transformer and communication lines and, in fact, only a part of the goniometric path is controlled, namely, the CPU itself. In addition, the known device can be implemented only with a CPU having differential input amplifiers, which is a certain limitation.

In practice, the control of the CPU by a large number of corner points is necessary only at the stage of laboratory and design tests of the head samples of converters. In the serial production of the CPU under the control of the CPU as part of the goniometer path, to assess the operability and accuracy of the conversion, sufficient control over a limited number of characteristic points covering the entire measured range (360 °) is sufficient.

The problem solved by the utility model is the creation of a simple and accurate device for automatic control of the entire goniometric path, including the CPU and VT, providing the ability to control the parameters of the converter at any angle of rotation of the VT shaft during its operation, without the use of metrologically certified equipment, and to increase the reliability of control using the same switching elements during control and in operating mode.

The essence of the utility model is that a rotary transformer (VT) is additionally introduced into the control unit of the CPU containing the first, second, third and fourth keys and configured to transmit signals from the tested CPU to the computer and receive key management signals from the computer, the first , the second, third and fourth keys are made bipolar, the first inputs of the bipolar keys are interconnected and are inputs for connecting the excitation voltage of the tested CPU to the output, the second inputs of the bipolar keys are interconnected and are inputs for connecting to zero the excitation voltage of the tested CPU, the outputs of the first and second keys are connected respectively to the first and second terminals of the first stator winding VT, the outputs of the third and fourth keys are connected respectively to the first and second terminals of the second stator winding BT, the first and the second conclusions of the first rotor winding VT are outputs for connecting respectively to the sinus and inverse sinus inputs of the tested CPU, and the first and second conclusions of the second rotor VT windings are outputs for connecting, respectively, to the cosine and inverse cosine inputs of the tested CPU, while the control inputs of the keys are supplied with signals connecting the stator windings of the VT in certain various combinations with the excitation voltage or zero excitation voltage and generating voltage on the rotor windings of the VT corresponding to the specified angles additionally shifted by the angle of rotation of the shaft.

At the same time, when the VT shaft is stationary, test signals are generated in the VT by switching its stator windings in a sequence that ensures that the rotor windings of the VT receive signals equivalent to the VT signals at corner points that are multiples of 45 °, but additionally shifted by the angle of rotation of the VT shaft - α. When processing the measurements obtained during the control, the displacement α is removed from all points by simple subtraction in the computer.

The essence of the utility model is illustrated in the drawing, which shows:

1 - switching unit;

2-5 - bipolar keys;

6 - rotating transformer (VT);

7 - an electronic computer (computer);

8 - checked digital angle converter (CPU).

проверяемого ЦПУ 8 и подключены к этим входам при контроле ЦПУ 8. Первый вывод (Р3) и второй вывод (Р4) второй роторной обмотка ВТ 6 являются выходами для подключения соответственно к косинусному входу (Ucosα) и инверсному косинусному входу

контролируемого ЦПУ 6 подключены к этим входам при контроле ЦПУ 8. При этом на управляющие входы ключей 2-5 при контроле ЦПУ 8 подаются сигналы, подключающие на статорные обмотки ВТ в определенных различных комбинациях напряжение возбуждения или нуль напряжения возбуждения и формирующие на роторных обмотках ВТ напряжения, соответствующие заданным углам, дополнительно сдвинутым на угол поворота вала α.The proposed device for automatic control of the CPU contains the first, second, third and fourth bipolar keys 2-5, forming the switching unit 1, and VT 6. The device is configured to transmit to the computer 7 signals from the tested CPU 8 and receive from the computer 7 key management signals 2 -5, forming the switching unit 1. The first inputs of keys 2-5 are interconnected, are inputs for connecting to the output of the excitation voltage Usinωt of the CPU 8 and are connected to this output when monitoring the CPU 8. The second inputs 2-5 are interconnected and are inputs and to connect to zero the excitation voltage of the CPU 8 (“0” pit) and connected to zero the excitation voltage during the control of the CPU 8. The outputs of the first key 2 and the second key 3 are connected to the first terminal (C1) and the second terminal (C2), respectively the first stator winding BT 6. The outputs of the third key 4 and the fourth key 5 are connected respectively to the first terminal (C3) and the second terminal (C4) of the stator winding BT 6. The first terminal (P1) and the second terminal (P2) of the first rotor winding BT 6 are outputs for connecting respectively to the sine input (Usinα) and inverse sinus input

of the tested CPU 8 and connected to these inputs when monitoring the CPU 8. The first terminal (P3) and second terminal (P4) of the second rotor winding BT 6 are outputs for connecting to the cosine input (Ucosα) and the inverse cosine input, respectively

of the controlled CPU 6 are connected to these inputs during the control of the CPU 8. In this case, the control inputs of the keys 2-5 during the control of the CPU 8 are supplied with signals connecting the excitation voltage or zero excitation voltage to the stator windings of the VT in certain various combinations and generating voltage on the rotor windings of the VT corresponding to predetermined angles, further shifted by the angle of rotation of the shaft α.

When monitoring the CPU 8, the control inputs of the switching unit 1 are connected to the control outputs of the computer 7, through which the switching unit 1 and the rotating transformer 6, the shaft of which is rotated through an angle α, generate test signals corresponding to the angles (0 + α) °, (45 + α ) °, (90 + α) °, (135 + α) °, (180 + α) °, (225 + α) °, (270 + α) ° and (315 + α) °, for the controlled CPU 8 according to following table 1.

Where K1, K2, K3 and K4 are keys 2, 3, 4 and 5, respectively,

0 - the lower position of the bipolar switch (connecting zero power),

1 - upper position of the bipolar switch (connection voltage Usinωt)

α is a random angle in which the shaft of VT 6 is fixed.

The proposed device for automatic control of the CPU 8 is as follows.

When the goniometer path is used for its intended purpose, keys 2-5 of switching unit 1 are installed in accordance with check 1 of table 1.

In this case, the excitation voltage (Usinωt) is supplied to the first stator winding of VT 6 with keys 1 and 2, and the second stator winding of VT 6 is shorted with keys 4 and 5. This inclusion of VT 6 corresponds to the traditional switching of rotary transformers with a pulsating field and the conversion result is proportional to the angle of rotation of the shaft α. When monitoring CPU 8 with a stationary shaft, checks 0–7 of table 1 are performed. As a result, the results of converting the angle will correspond to angles 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, and 315 ° shifted by shaft rotation angle α, i.e. angles (0 + α) °, (45 + α) °, (90 + α) °, (135 + α) °, (180 + α) °, (225 + α) °, (270 + α) and (315 + α) °, respectively. Taking into account that with the VT 6 shaft fixed, the angle α is the same for all checks, we can calculate the errors of the goniometer path for all the checks in the table by subtracting the angle α obtained in test 0 from the values of the angles obtained in tests 1-7 and comparing subtraction results with calculated values of controlled angles. Computer 7 determines the absolute error and, if necessary, calculates all metrological characteristics - dispersion, standard deviation, and so on.

There are practically no additional metrological requirements for the device under consideration, since the same voltage is connected to the VT 6 stator windings in different combinations and the accuracy of the device is entirely determined by the accuracy used in the goniometer path of the rotating transformer 6.

It is important to note that during the control in the device in question, the check covers all the elements involved in the regular operation of the goniometric path.

Another advantage of the proposed device is that the switched voltages and currents in the device are quite large (units of volts and milliamps), while in known devices switching the input signals of the CPU, at some points, the switched voltages and currents can be essentially zero or close to it. This fact greatly facilitates the selection of switching elements (including relay).

Thus, the technical result of using the proposed utility model is to increase the accuracy of the control of the CPU and the entire goniometric path.

The industrial applicability of the utility model is determined by the fact that the proposed device can be manufactured on the basis of the above description and drawings and used to automatically monitor the functioning and accuracy of the CPU (angle-to-code converter) and the entire goniometer path in which the tested CPU is used.

Information sources

1. A.A. Akhmetzhanov, A.V. Kochemasov. Tracking systems and regulators. Moscow, Energoatomizdat, 1986

2. V.G. Domrachev, V.R. Matveevsky, Yu.S. Smirnov. Circuitry of digital motion converters. Moscow, Energoatomizdat, 1987

3. Testimonial. RF №22992 at the PM, IPC G01B 21/22, publ. 05/10/2002 (prototype).

Claims (1)

The control device of the digital angle converter (CPU) containing the first, second, third and fourth keys, while the control device of the CPU is configured to transmit to the electronic computer (computer) signals from the tested CPU and receive from the computer key management signals, characterized in that a rotary transformer (BT) is additionally introduced into the device, the first, second, third and fourth keys are double-pole, the first inputs of the double-pole keys are interconnected and are inputs for connecting to the excitation voltage of the tested CPU, the second inputs of the bipolar keys are interconnected and are inputs for connecting the excitation voltage of the tested CPU to zero, the outputs of the first and second keys are connected respectively to the first and second outputs of the first stator winding BT, the outputs of the third and fourth keys are connected respectively to the first and second conclusions of the second stator winding of the VT, the first and second conclusions of the first rotor winding of the VT are outputs for connecting respectively to the sine and inv to the sine input of the tested CPU, and the first and second outputs of the second rotor winding of the VT are outputs for connecting respectively to the cosine and inverse cosine inputs of the tested CPU, while the control inputs of the keys are fed signals that connect the stator windings of the VT in certain different combinations of excitation voltage or the excitation voltage is zero and the voltages forming on the rotor windings of the VT corresponding to the given angles are further shifted by the angle of rotation of the shaft.

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