UA121540U - Contactless measuring device for axial rotor life of an electric machine - Google Patents

Abstract

The non-contact device for measuring the axial beating of a rotor of an electric machine comprises a scale converter, a filter and a numerical converter. The filter is a high pass filter. An exemplary high-frequency oscillator, electromagnetic wave radiation unit, reflective coating, electromagnetic wave receiving unit, transmission line, analog multiplication unit, two comparators, clock generator, two logic elements I, binary counter and digital-to-analog converter were introduced.

Description

The useful model belongs to the measuring technique and can be used to determine the axial runout of the rotor of electric machines.

A device for determining the parameters of the oscillations of a rotating rotor is known, described in the patent of the Russian Federation Mo 2180435, MPK СО1М 1/22, 10.03.2002, which consists of a coil connected to the rotor of an inductor and a magnet.

A device for measuring rotor radial runout (Ukrainian patent) was chosen as the prototype

Mo 89369, m. cl. 2401М 1/22, publ. 25.04.2014, Bull. Mo 8), which contains a light source, which is optically connected to a condenser lens, which is optically connected to a focusing lens, a microcontroller (hereinafter, a digital converter), which is connected to an indicator, a linear photodetector, which is optically connected to focal lens, the output of which is connected to a filter connected to a scaling converter, which is connected to an analog-to-digital converter connected to a microcontroller.

The disadvantage of this device is limited functionality, which does not allow it to be used to measure the axial runout of the rotor of an electric machine, as well as low measurement accuracy, which is due to the use of the average value of the light flux intensity as an information signal, which is sensitive to external non-informative disturbances and does not allow measurements instantaneous values of rotor beating.

The basis of the useful model is the task of creating a non-contact device in which, due to the introduction of new elements and connections, it is possible to increase the accuracy, as well as to measure the instantaneous value of the rotor beat.

The task is solved by the fact that a high-pass filter is used as a filter in the non-contact device for measuring the axial runout of the rotor of an electric machine, which contains a scale converter, a filter and a digital converter, according to a useful model, in addition, an exemplary high-frequency generator, an electromagnetic radiation unit is introduced into it waves, a reflective coating, an electromagnetic wave receiving unit, a transmission line, an analog multiplication unit, two comparators, a clock generator, two logic elements Y, a binary counter and a digital-to-analog converter, and the output of the sample high-frequency generator is connected to the inputs of the electromagnetic wave emission unit and transmission lines, the output of the electromagnetic wave receiving unit is connected to the input of the scaling converter, the outputs of the scaling converter and the transmission lines are respectively connected to the first and second inputs of the analog multiplication unit, the output of which is connected to the input of the high-pass filter, the output of the high-pass filter is connected to the first input of the first and the second input of the second comparator, the outputs of the comparators are connected to the first inputs of the first and second logic elements AND, the output of the clock generator is connected to the second inputs of the first and second logic elements AND, the outputs of the first and of the second logical elements AND are connected to the first and second inputs of the binary counter, respectively, the digital output of the binary counter is connected to the inputs of the digital converter and the digital-to-analog converter, the output of the digital-to-analog converter is connected to the second input of the first and the first input of the second comparator , and the output of the digital converter is the output of the device.

The drawing shows the structural diagram of the device.

The device contains a high-frequency generator 8, the output of which is connected to the inputs of the electromagnetic wave radiating unit 4 and the transmission line 7, the output of the electromagnetic wave receiving unit Z is connected to the input of the scale converter 5, the outputs of the scale converter 5 and the transmission line 7 are respectively connected with the first and second inputs of the analog multiplication block 6, the output of which is connected to the input of the high-pass filter 9, the output of the high-pass filter 9 is connected to the first input of the first 10 and the second input of the second 11 comparators, the outputs of the comparators 10, 11 are connected with the first inputs of the first 13 and the second 14 logic elements AND, the output of the clock generator 12 is connected to the second inputs of the first 13 and the second 14 logic elements AND, the outputs of the first 13 and the second 14 logic elements AND are connected, respectively, to the first and second inputs of the binary counter 16, the digital output of the binary counter 16 is connected to the inputs of the digital converter 17 and the digital-to-analog converter 15, you the course of the digital-to-analog converter 15 is connected to the second input of the first 10 and the first input of the second 11 comparators, and the output of the digital converter 17 is the output of a non-contact device for measuring the axial displacement of the rotor of an electric machine. Position "1" indicates the rotor shaft with reflective coating 2 applied to its frontal projection.

The device works like this.

From the high-frequency generator 8, a signal of a given length of the electromagnetic wave is sent to the input of the electromagnetic wave radiation block 4 60. From the output of the electromagnetic wave radiation unit 4, a directed radiation of the wave received from the high-frequency generator 8 occurs in the direction of the front projection of the rotor shaft 1, on which the reflective coating 2 is applied. Having reached the reflective coating 2, the wave that was emitted from the output of the electromagnetic wave radiation unit 4 is reflected towards the electromagnetic wave receiving block 3. At the same time, depending on the magnitude and sign of the axial displacement of the frontal projection of the rotor shaft 1, the distance between it and the radiation and receiving blocks 4 changes

From an electromagnetic wave. At the same time, the signal received at the input of the electromagnetic wave receiving unit C undergoes a phase shift, the value of which is functionally dependent on the axial displacement of the front projection of the rotor shaft 1. From the output of the electromagnetic wave receiving unit C, the received signal is transmitted to the input of scale converter 5, where its amplitude is stabilized. Simultaneously with the described process, the signal from the output of the high-frequency generator 8 is fed to the input of the transmission line 7, where its phase shift occurs by an amount corresponding to the zero offset of the displacement of the front projection of the rotor shaft 1. From the outputs of the scale converter 5 and the transmission line 7, the signals are fed to the input of the block of analog multiplication 6. As a result of multiplication of the specified signals in the block of analog multiplication 6, we get the following signal at its output:

A. vigiei tt). And vipisi te)» In AtAoivigi fi fo) Vigo Fi nd

From the output of the analog multiplication unit 6, this signal is fed to the high-pass filter 9, where the time-varying signals are filtered, both the higher harmonics obtained as a result of the multiplication and the time-varying random noise. As a result of this operation, a signal is obtained at the output of the high-pass filter 9, which connects the output voltage level of At" vigifi.)

A A". . . ssh -. where 7 is the amplitude of the signals from the outputs of the scale converter 5 and the transmission line 7;

Phil). functionally related to the displacement of the rotor shaft, the phase shift of the signal with the output of the scale converter 5.

The filtered constant voltage component from the output of the high-frequency filter 9 enters the first input of the first 10 and the second input of the second 11 comparators. Accordingly, the second input of the first 10 and the first input of the second 11 comparators receives a signal from the digital output

From the analog converter 15, which is proportional to the current code at the output of the binary counter 16. At the outputs of the comparators 10 and 11, a logic unit signal appears if the voltage level at the first input is higher than the voltage level at the second input. In this case, if the signal at the output of the high-pass filter 9 has a higher level than the signal at the output of the digital-to-analog converter 15, a logical one signal is set at the output of the first comparator 10, and a logical zero signal at the output of the second comparator 11. If, on the contrary, the signal at the output of the high-pass filter 9 has a lower level than the signal coming from the output of the digital-to-analog converter 15, then a logical unit signal is set at the output of the second comparator 11, and a logical zero signal is set at the output of the first comparator 10. When a logical unit is set at the output of the first 10 or second 11 comparator, the first 13 or second 14 logical element I is "opened". At the same time, pulses from the output of the clock generator 12 are received, respectively, at the first or second input of the binary counter 16. In the event that the pulse from the output of the clock generator 12 enters the first input of the binary counter 16, its output code increases by one, as a result of which the signal from the output of the digital-to-analog converter 15 also increases proportionally. If the pulse from the output of the clock generator 12 enters the second input of the binary counter 16, its output code is reduced by one, as a result of which the signal from the output of the digital-to-analog converter 15 is also reduced. The output signal of the binary counter is fed to the inputs of the digital-to-analog converter 15, where it is converted into an analog voltage level, and to the input of the digital converter 17. In the numerical converter 17, the calculation is carried out calculation of the instantaneous axial displacement of the rotor of the electric machine based on the known transformation equation and the value read from the output of the binary counter.

Claims (1)

USEFUL MODEL FORMULA A non-contact electric machine rotor axial runout measuring device containing a scaling converter, a filter and a digital converter, which is characterized by the use of a high-pass filter as a filter, and also includes an exemplary high-frequency generator, an electromagnetic wave emitting unit, a reflective coating, a receiving unit of an electromagnetic wave, a transmission line, an analog multiplication unit, two comparators, a clock generator, two AND logic elements, a binary counter and a digital-to-analog converter, and the output of the sample high-frequency generator is connected to the inputs of the electromagnetic wave radiation unit and the transmission line, the output of the receiving unit electromagnetic wave is connected to the input of the scaling converter, the outputs of the scaling converter and the transmission line are respectively connected to the first and second inputs of the analog multiplication unit, the output of which is connected to the input of the high-pass filter, the output of the high-pass filter is connected to the first and the input of the first and the second input of the second comparator, the outputs of the comparators are connected to the first inputs of the first and second logic elements AND, the output of the clock generator is connected to the second inputs of the first and second logic elements Y, the outputs of the first and second logic elements AND are connected corresponding to the first and second inputs of the binary counter, the digital output of the binary counter is connected to the inputs of the digital-to-analog converter, the output of the digital-to-analog converter is connected to the second input of the first and the first input of the second comparator, and the output of the digital converter is the output device. I look! g chi ki pt pesni she o t Z sh NN women 1 and their a SCHE vk ve i Kun re i Mosshy i re Z i p y h r v shiya se shi | OM and TV MV! shk i ni SHIN pria, PI N Ishche pana GUKA them. : Y i pon i VOYU ble in lan in i i i E pe