SU1307383A2 - Device for measuring phase error signal - Google Patents

Abstract

The invention can be used to fix the presence of a phase mismatch between the rotating shafts of two mechanisms in closed automatic control systems and is an additional condition of the fluid flow cell number 748278. The device consists of two channels. Each channel contains also 1.1-1.2, 1.1-2.2, 2.1-2.2 most powerful sensors, frequency-voltage converters 3.1-3.2, integrators 4.1-4.2 with elements 7.8 and 9. In addition, the device includes an adder 10, a comparator 11, a switch 12 , the source 13 of the reference voltage and shapers 5.1-5.2 pulses. The introduction of blocks 6, 15 and 19 of the comparison, the formation block 14, additional reference voltages, the pulse shaper 16, the control block 17 by the switch 18 expands the range of the compared phase shifts to 8 and increases the sensitivity to the signal. 1 il. t G Yu CO

Description

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The invention relates to a metering and switching technique and can be used to detect the presence of a phase mismatch between the rotating shafts of two mechanisms in closed automatic control systems.

The purpose of the invention is to improve the accuracy of fixing the presence of phase shifts and expanding the range of compared phase shifts.

The goal is achieved. due to the range of compared phase shifts to Slf and an increase in fixing accuracy due to greater sensitivity to the signal.

The drawing shows a structural scheme of the proposed device.

The device consists of two channels. Each channel contains the main pulse sensors 1.1-1.2 and additional pulse sensors 2.1-2.2. The outputs of the main pulse sensors are connected to the inputs of frequency-voltage converters 3.1-3.2, the outputs of which are connected to the inputs of integrators 4.1-4.2. The outputs of the additional pulse sensors 2.1-2.2 through the formers 5.1-5.2 are connected to the inputs Reset each of the integrators 4.1-4.2. The outputs of the integrators 4.1 and 4.2 are connected respectively to the first and second inputs of the comparison unit 6. Elements 7-9 are part of the integrators 4.1-.4.2, the output of block 6 is connected to the first input of the adder 10 and through the series-connected comparator 11 and key 12 to the second input of the same adder 10, while the source 13 of the reference voltage is connected to the second input of the key 12, and the output of the adder 10 is connected to the input of the unit 14 for generating additional reference voltages and the input of the second comparison unit 15, the output of which is connected to the first input of the additional pulse former 16, the output of which is through the control unit 17 The switches of the switch 18, the output of which is the output of the device, the first and second inputs of the second comparison unit 19, respectively, are connected to the outputs, and the comparison unit 19 constitutes the external characteristic driver (PVH).

The device works as follows.

From the moment of appearance of a pulse at the output from the main sensors 1, the pulses from the additional sensors 2 are fed to the inputs of frequency converters 3 in voltage, the output voltage of which is proportional to the instantaneous speed value of each of the shafts connected to sensors 1 and 2, this voltage to the inputs of the integrators 4. The outputs of the integrators 4 are connected to the inputs of the comparison unit 6, the output of which produces a signal proportional to the voltage difference at the outputs of the integrators or the speed difference of the rotating shafts. For resetting the integrators, the formers 5 are used, while during the resetting of the integrators 4, the output voltage of the unit b. reaches a maximum. This moment is used to connect the reference voltage (source 13). For this, the output voltage of the comparison unit is supplied to the adder 10 directly and simultaneously through the comparator 11 and the switch 12 to the second input of the adder 10. Such a connection extends the range of measurement of the phase angles. The introduction of an external characteristic shaper (PVH) improves the control accuracy.

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PVH works as follows. Comparison element 15 converts the output voltage Ug, x, the adder 10 into a series of rectangular pulses Unj, and at where UCP is the comparator tripping voltage, the unit voltage is generated. level (and,;, 1), and with ,,, - from the zero level of the comparator state (and, 0). Similarly, the comparison is performed by block 19. When U. U, the level of a logical unit (and 1) is formed, and at) and - logical zero (U 0), where U and and are the voltage from the outputs of frequency converters 3 to voltage. The pulse shaper 16 generates pulses On the leading edge change50

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Formers 3.1-3.2 frequency-for example - 55 on the back (subject to

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, one). Control block 17 represents

Block 14, comparison unit 15, driver 16, control unit 17.

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switch

18 and the comparison unit 19 constitute the external characteristic driver (PVM).

The device works as follows.

From the moment of appearance of a pulse at the output from the main sensors 1, the pulses from the additional sensors 2 are fed to the inputs of frequency converters 3 in voltage, the output voltage of which is proportional to the instantaneous speed value of each of the shafts connected to sensors 1 and 2, this voltage to the inputs of the integrators 4. The outputs of the integrators 4 are connected to the inputs of the comparison unit 6, the output of which produces a signal proportional to the voltage difference at the outputs of the integrators or the speed difference of the rotating shafts. For resetting the integrators, the formers 5 are used, while during the resetting of the integrators 4, the output voltage of the unit b. reaches a maximum. This moment is used to connect the reference voltage (source 13). For this, the output voltage of the comparison unit is supplied to the adder 10 directly and simultaneously through the comparator 11 and the switch 12 to the second input of the adder 10. Such a connection extends the range of measurement of the phase angles. The introduction of an external characteristic shaper (PVH) improves the control accuracy.

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PVH works as follows. Comparison element 15 converts the output voltage Ug, x, the adder 10 into a series of rectangular pulses Unj, and at where UCP is the comparator tripping voltage, the unit voltage is generated. level (and,;, 1), and with ,,, - from the zero level of the comparator state (and, 0). Similarly, the comparison is performed by block 19. When U. U, the level of a logical unit (and 1) is formed, and at) and - logical zero (U 0), where U and and are the voltage from the outputs of frequency converters 3 to voltage. The pulse shaper 16 generates pulses On the leading edge change0

,,

and 1

, one). Control block 17 represents

is a reversible pulse counter.

arriving from the driver 16, the counter works on summation at and O and on subtraction at .1. In addition, in the switch node 5Т1, the switch provides for limiting the counting when the counter reaches the number O in the subtraction mode and the number 3 in the summation mode.

Block 14 additional support lapses form stresses

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The switch 18, in accordance with the x-th state of the counter of the control unit 17, connects the corresponding reference voltage from one of the outputs of the source of additional reference voltages to the output of the entire device.

Claims (1)

Invention Formula A device for measuring the phase mismatch according to the author. 748278, of which it is said that Compiled by V. Shubin Editor A. Revin Tekhred L. Serdyukova Order 1628/45 Circulation 731 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 O S 0 five The purpose of increasing the accuracy of fixing the presence of phase shifts and expanding the range of compared phase shifts, a pulse shaper, two comparison units, an additional reference voltage generation unit, a switch and a switch control unit are entered, the information inputs of the switch are connected to the corresponding outputs of the additional reference voltage generation unit control input of the switch is connected to the output of the control unit 1c with a switch, the first input of the pulse shaper is connected to the output The first unit is compared to the first input of the control unit by the commentator, the second input of which is connected to the output of the pulse generator, the second input of which is connected to the code of the second comparison unit, the input of which is connected to the input of the unit for generating additional reference voltages and to the code of adder, first and The second inputs of the first comparison element are connected to the outputs of the first and second frequency converters to voltage respectively, and the output of the device is the output of the output device, Proofreader M. Demchik