SU1718343A1 - The method of definition of impregnation factor of windings of motors and device for its realization - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control the quality of windings impregnation during the production of electric motors. The aim of the invention is to improve the accuracy. The invention consists in measuring the capacity of a winding relative to the body of an electric machine at a frequency fi and calculating from the results of measuring the coefficient of impregnation. A feature of the invention is the additional measurement of the capacitance at the frequency fc, and the frequencies fi and fe are chosen respectively in the dispersion and optical frequency regions, for which the dependence of the dielectric constant on the frequency for the impregnating fluid is respectively expressed or absent. The device comprises a generator 1, an amplifier 2, a detector 3, an A / D converter 4, a converter 5, interface blocks 6 and calculations 7 and a control block 8. A feature of the device is the use of a synchronous detector as detector 3 and a dual-frequency generator as generator 1. 2 sec. f-ly, 5 ill. sl C

Description

the value of the equivalent body and enamel capacitance at frequencies fi and f2 and the fact ° ° Рдг. „Ги.гс ... l

Substituting the values from expressions (24) and (25) into formulas (18), (19), we obtain

45

(

3 eteLCcVm / cq i-O

Let each of the controlled pro; the powered batch windings are measured capacitance relative to the magnetic core at frequencies f i and f2. Denote the capacity of some C; rf ,, & k,) Knp (26)

50

Stch% a iC Kn22 KnP

(27)

Substituting in the expression (26) the values of Sk1 and g from the formula (14) and (16) and in the expression (27) the values of GK2 and g from the formulas (15) and (17), receive

taking into account that the coefficient of impregnation on chacU i. with pe | Uy,

 r-con

an c r, LtM u 3n «:,„ ,. - -five

6, l. , .J K-, aWcfaXDiEti

(C4naHCgng J yJkpr. (P .- ..; j: - yy

 vfeMM, k, |

E ,, - 1Ј „-r1-1 CTOtax.fl and f2 remain the same,

...,. -. -,) get the formula for determining the coefficient ":,",% B "-D with" P (HFC ", (- Impregnation factor

 . CP, 3 S9P g,

 -i P-- „| G.„ g IJ

„Р-т7-е“ - “- - where.

.10 A- eenh iCc.) Recognizing expressions (28) egs

(29) and expressing the coefficient of impregnation QPR, r fc L .1 g-o fp - ...

get ftnni, --C {1 C-DЈ c nj

g. &. . .i; .

CRC -; : r / lti V

Bpe4 (.c (E, r1). CmG6 ((. ЗД-b D-Ј, (Cnn, -r-4h

 3L c | mJ -v ° WF -ap i:

I.

, elaCGTs -). , e, cU. . . fr

--- eti-r- g --ntt t VbJ, H) p (- QftrcW (

enЈtt (. l

 ° L with lg-1 u.

In expressions (30) and (31), in fact, a non-device that implements a method has two known values of ,222.221. Therefore, dividing the winding impregnation coefficient to find these quantities of electric machines, works as follows to have one more equation that relates

their. This equation can be obtained when 25 Press the Start button 1 to study the frequency dependences of the diz-voltage of a triangular shape with the electrical permeability of the impregnation tank lying in the dispersion region, the composition of its degree of cure (Fig. 3). for example, 100 Hz (Fig. 5, plot a), using these dependencies, a graph is plotted by a two-frequency oscillator 1 posusvyazyvayuschim ry value на22 at a frequency f2. c30 flows through the test capacitance Cx with the value Ј21 at the frequency fi at different stator-winding 9 to the current amplifier 2, where the drying degrees of the impregnation voltage are as a result of the differential switch (Fig.). For various impregnating vanities, it acquires the shape of a rectangular dependence of the composition between the dielectric amplitude proportional to the capacitance Cx

The permeabilities Ј22 and Ј21 can35 (Fig. 5, plot b), and then through synchronous are described by various functions, one detector 3 is fed to the A / D converter 4, where the conversion of voltage to binary is performed with a sufficient degree of accuracy. - a polynomial parallel code arriving in the second order can be approximated. The input of the converter 5, in which the output from this is given, determines the conversion of the binary code to

binary-decimal sequential-Ј22 bo + biln Ј21 + b2 nЈ21 2, (32) parallel code, which, in turn,

 is converted to a consecutive decade of D2. bt, b2 are the coefficients of the equation code in block 6 of conjugation and are entered

regressions determined for each pro-45 in the memory of the computational unit 7. Experimental input of the interface block of the three equations (30) —the end input signal (KV) (Fig.5 plot (32) c), which enters the control unit 8,

where two signals are formed (phi 5, plots

/ s "L) 50 g and e), permitting the repeated measurement of i l | C | inil c 1) Cx at a frequency lying in the optical band, for example, 5000 Hz, and writing to memory.

 hЈ (Gs Thus, according to the measurement result

c, f33) Cgni. Cgn2, Cnni, Cnn2 entered into memory

Ј, 4sp "g (-g -m55 computing, unit 7, automatically

{, Caft2 / ...: I i .. ... -.,

 About m - -:

.in - 3-p --.--- j, the impregnation coefficient is calculated according to the equation (Era-i -Cm LЈ s j according to (34), and the frequencies fi and f2 are selected by G1 Lr a priori according to

Enuhhh bo4-b1Ј «e, g, burr bpblL dependence of e liquid impregnating composition on the frequency (fig.Z).

taking into account that the coefficient of impregnation on the CCTOtax .fl and f2 remains the same,

Claims (2)

Claim 1. Method for determining the coefficient of impregnation of the windings of electric machines by measuring the capacity of the windings relative to the case at a frequency fi, at which the capacity of each winding relative to the case is measured before and after impregnation with the impregnating fluid and subsequent drying, measure the capacity of one of the windings chosen at random from batch, relative to the body before and after complete impregnation with an impregnating liquid with a known dielectric constant, and determine the impregnation coefficient from the results of Yeni, about tl and h and y i and with. The fact is that, in order to increase accuracy, the capacities of each and one randomly selected from a batch of windings are measured relative to the case at a frequency, .fe, and the frequencies ft and h are chosen respectively in the dispersion and optical frequency regions for the dependence of the dielectric constant on the frequency for the impregnating liquid, respectively, is expressed or not, measure the degree of change in the value of the dielectric constant of the impregnating liquid during its curing at a frequency fi and fix the that the dielectric constant impregnating fluids at frequency f2, and the coefficient of impregnation of the windings of the electric machine is determined by formuleL uwcMsfEtfy. :: nrbfblenft 7ttf.eni% bJb0 enf} 2: A Ј | gspl4 (spp2 / s pg) i where, - if, r (R. mf & 4-) s, s 2-cppg,,, -9 "1 .1 No -e „sp / with. /with PPLC, -1 V t- an i / Cgni, Cnni, Cgn2, Cnn2 - winding capacity relative to the body before and after impregnation and drying at frequencies fi and f2, respectively, 1 Cgni, Cnni, Cgn2, Cnn2 is the capacitance of an arbitrarily selected winding relative to the body before and after complete impregnation with an impregnating fluid with a known dielectric constant of Ј c and Ј 12 n. frequencies f 1 and f2, respectively; bo, bi. b is the coefficient of the regression equation In Ј22 bo + blln 621 + D2 (ln 2l) 2, which is approximated by a functional 0 the relationship between the change in the dielectric constant of the impregnating liquid during curing at a frequency fi and the dielectric constant of the impregnating liquid on 5 frequency h Ј21, Ј22 is the dielectric constant of the impregnating composition at frequencies fi and f2, respectively, in the dried .. windings. 0 2. A device for determining the coefficient of impregnation of the windings of electric machines, containing a two-frequency generator, the first output of which is the first terminal for connecting the test winding, the measuring amplifier whose input is the second terminal for connecting the test winding, detector and recorder connected in series with the goal of 0 increases the accuracy, a synchronous detector is used as a detector, an analog-to-digital converter, a code converter, an interface block and a computational signal are used as a recorder 5, a unit connected in series, a control unit is inserted, a frequency control input and a reference output are input to the dual-frequency generator, the analog-to-digital converter input being the recorder input, 0 the reference output of the two-frequency generator is connected to the reference input of the synchronous detector, the first output of the control unit is connected to the input of the frequency control of the two-frequency generator, the second output 5 is connected to the control input of the analog-to-digital converter, and the input of the control unit is connected to the second output of the interface block. unuspxdaguio wauatjn # - / - g ipnzjjhedshshojizyzz & -d - L vprzHPadsho energies & -g - g & pne {w e zsho chnaiashé srwaffxaagwo knowledgeable s-из- YipNedzhjadsho oneiashz tf-z - Ј ypnazhadzho sheeei / z1-g W-UX pphrpzh-f 9i Y / Uh yours fn € ss and U, f.4J.C and a F1 „Start It 2.0 22 2.4 ZB tab zt Fit.CH F2 „™ T „“ In „Lerekl. F t one “Zap. ADC