SU1260672A1 - Contactless profilometer for checking microgeometry of electrical machine commutators - Google Patents

Abstract

The invention relates to a measurement technique and can be used in various industrial zones to control the microgeometry of the working surface of collectors of electrical machines. The aim of the invention is to improve the accuracy of measurements by providing synchronization of measurements when changing the frequency of rotation of the collector. The signal from the first interlace converter enters the measuring circuit, from which the signal is fed to the processing unit of the measuring signal. In the measurement signal processing unit, the amplitude values of the measurement signal are proportional to the geometry of the plates of the measured collector. The unit generates signals of the difference of amplitude values from these signals, stores them and sends them to the recorder. The measurement of the amplitude values of the signal to the middle of the collector plate is carried out using a second displacement transducer offset from the first transducer by half the collector period. The signal from the second displacement transducer enters the control unit, which synchronizes the operation of the measuring signal processing unit. 1 hp f-ly, 2 il .. about S SP

Description

The invention relates to a measurement technique and can be used in various fields of industry to control the microgeometry of the working surface of collectors of electrical machines.

The aim of the invention is to improve the accuracy of measurements by providing synchronization of measurements when changing the frequency of rotation of the collector.

On fng.1 presents a block diagram of the device; 2 is a control block diagram.

The contactless profilometer contains the first displacement transducer 1 mounted above the working surface of the monitored collector 2 and connected to the power supply unit 3 and the measuring circuit 4, the measuring signal processing unit 5 connected to the measuring circuit 4, the first, second and third inputs with the control unit 6, output - with a recorder 7. The profilometer also contains a second transducer of 8 displacements offset from the first transducer of displacements by half of the collector division bk / 2 into tang The potential direction of the collector and connected to the power supply unit 3 and the control unit b. The working surface of the collector 2 consists of alternating plates 9 of highly electrically conductive material and insulating gaps 10. The collector division bk is the distance between the centers of two adjacent collector plates, and half of the collector division bk / 2 is the distance between the centers of the collector plates and neighboring insulating gaps.

The control unit 6 (FIG. 2) contains a measuring circuit 11 connected to the first input of the comparator 1 whose output is connected to the limiter 13, the source 14 of the reference signal connected to the second input

Parator 12, and the circuit 15 reset.

Contactless profilometer works as follows.

The output of the first displacement transducer 1, proportional to the distance between the transducer and the surface of the rotating collector 2 being monitored, is extracted by the measuring circuit 4,

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it is amplified by it, inverted, and in the form of a sequence of pulses from the collector plates enters the input of the measuring signal processing unit 5. The amplitude values of the pulses of the measuring signal, which carry information about the true height of the collector plates, are reached at the moments when the first transducer 1 is located over the centers of the corresponding collector plates 9. At the same times, the second transducer 8 moves due to its half shift of the collector division relative to the first converter 1, is located above the centers of the insulation slots 10, whose width is 4-6 times less than the width of the collector plates. Therefore, narrow pulses are removed from the output of the second transducer 8, corresponding to the insulating gaps, which are fed to the control unit 6, where they are formed and fed to the first control input of the measuring signal processing unit 5 strictly synchronously with the amplitude values of the measuring signal regardless of the frequency of rotation of the collector . The measuring signal processing unit 5, based on the control pulses from the control unit 6, extracts the amplitude values of the measurement signal, generates a signal proportional to the difference in amplitude values of the measurement signal from each two adjacent collector plates, extracts the maximum value of the difference signal, stores it and sends it to the recorder 7. Thus, on the recorder 7, the magnitude of the maximum difference between adjacent collector plates for one revolution of the collector is recorded. After the measurement is completed, the control unit 6 generates a reset signal, which is fed to the second control input of the measurement signal processing unit 5. This signal allows you to reset the value of the measured signal to zero and prepare a profilometer for a new measurement.

The control unit 6 operates as follows.

The output signal of the second displacement converter 8 is formed by the measuring circuit 11 and is supplied

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to the first input of the comparator 12. This signal has the same shape as the measuring signal, however it is shifted in time relative to it by half the collector period Tjj / 2, where TK is the collector period (the time between the amplitude values of the signal from two adjacent collector plates) . The second input of the comparator 12 is supplied by the reference voltage Pop from the source 14 of the reference signal. When the reference voltage level UQI is exceeded, the narrow pulses of the signal from the insulating gaps 10 switch the comparator 12 and a signal is output from its output in the form of narrow pulses. This signal is limited from above at the zero level by the limiter 13 and, in the form of control pulses, is applied to the second input of the measuring signal processing unit 5. The control pulses are always located exactly against the amplitude values of the measurement signal, regardless of the change in the rotation frequency of the collector. After the measurement is completed, the reset circuit 15 generates a reset signal, which is fed to the third input of the measuring signal processing unit 5 and prepares this block for a new processing cycle of the measuring signal.

Claims (2)

Formula from skimmer 1. Contactless profilometer for control microgeomatria collectors 5 O 0 0 five electrical machines, containing a displacement transducer, connected to its output measuring circuit, measuring signal processing unit associated with measuring output, circuit, control signal connected to the second and third inputs of measuring signal processing unit, output recorder measuring signal processing unit, characterized in that, in order to improve the measurement accuracy in terms of changing the frequency of rotation of the collector, it is equipped with a second displacement transducer, above the working surface of the controlled collector, shifted relative to the first transducer by half of the collector making in the tangential direction and (connected to the input of the Uiravla unit. 2. The profilometer according to claim 1; 1, characterized in that the control unit contains a chain from a positively connected measuring circuit, comparator, limiter, reference signal source connected to the second input of the comparator, a reset circuit, an input of a secondary circuit, an input and the outputs were limited also by the reset cheats - by the outputs of the control unit. FIG. ig. g Editor N.Gorvat Compiled by Y. Petrakovsky Tehred L.OleynikKorrektor M.Samborska Order 5214/36 Edition 670 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4