ࡱ>  x7bjbjpMpM 4P'o_'o_ P P 8D%)c>bbbbbbb$gehb9b4bdbbtY _O_R[<pbb0)c[0hjhx__XhX`bbj)chP [:'LABORATORY WORK NR. 5 Investigation of a three-phase asynchronous motor and frequency converter StudentDone(group)(signature)Defended(name and surname)(signature) OBJECT OF RESEARCH. To investigate thefrequencyinverteroptionsand their impact onengine performance. Set themotorparametersI0,P0,N versusfeedingvoltage,find out howto change thedirection of rotation. Examine the possibility to startthree-phaseasynchronous motorinone-phase network. The workflow Write down the nominal data of the motor: f = Hz, U = V, IN = A, PN = W, n = rot/min,  = , cos = ; Connect the circuit (fig. 4.1)  Fig. 4.1 Asynchronous motor testing circuit Turn the enginespeedanddirection ofchange,management. a) Turnvoltage switchS,the display shows0.0- which meansthatthe display will displayedfrequency f, Hz; b) Push the button  , display shows "FWD". c) In shortclickspressing the button"!"you will turn the motor and increase thespeed.!button will reduce thethe speed; d) To stop the motor, press the  button. e) Click will light upthe point"REV"this means that motors rotation rotates into opposite way, increaseanddecrease therpm by pressing thebuttons"!"and"!" SetengineidlingcurrentI0dependenceinverterfrequency f:I0=f (f). Turn onthe engine(3.a.b.points); Bypressing the button"!"andwatchingthe frequencyf in the display,change it approximatelyevery10Hzup to 120Hz; Write down theresultsin thetable 1.After themeasurement,stop the engine by pressing the button . Table 1. f, HzI0, A Calculate theenginepowerP0.In calculations useUf=220V,and theI0`abckmru}ʺ|gZOZOZOZOZOZOZO@htMh $OJQJmH sH htMh $mH sH htMh $CJmH sH )htMh $B*OJPJQJmH phsH !htMh $B*CJmH phsH h h $5CJmH sH h h 5CJmH sH !htMh B*CJmH phsH h $CJOJPJQJmH sH h)|CJOJPJQJmH sH $htMhh4CJOJPJQJmH sH $htMh $CJOJPJQJmH sH abcklmrs $$Ifa$gd $ $If`gd $ $`a$gd $ stu}~NB2BB$$If`a$gd $ $$Ifa$gd $kd$$IfTl4@r(+ ( p 244 laf4p2yt $T>22 $$Ifa$gd $kd3$$IfTl4@r(+ ( p 244 laf4p2yt $T$$If`a$gd $M=$$If`a$gd $kdf$$IfTl4@\+ p 244 laf4p(yt $T $$Ifa$gd $ $If`gd $VNBBBB $`a$gd $$a$gd $kds$$IfTl4@\+ p 244 laf4p(yt $T$$If`a$gd $G H K L ķ~~qqqbN:'htMhh>*CJOJPJQJmH sH 'htMh $>*CJOJPJQJmH sH htMhJOJQJmH sH htMhtMCJmH sH htMhJCJH*mH sH htMhJCJmH sH !htMhhB*CJmH phsH htMhhCJmH sH htMh $CJmH sH !htMh $B*CJmH ph&&&sH )htMhwB*OJPJQJmH phsH )htMh $B*OJPJQJmH phsH -  v   $`a$gdJ & FgdJ$ & F1$7$8$H$a$gdJ`gdJ`gd $gdJ ^`gdJ `gdh   V X 8 n | ӻӫӫӜrcccTcEhtMh !CJaJmH sH htMhtMCJaJmH sH htMh !CJaJmH sH htMhJCJmH sH 8jh7uh7uCJOJQJU^JaJmHnHsH uhtMhg$CJaJmH sH htMhJCJH*aJmH sH .htMhJ6CJ OJQJ]^JaJ mH sH htMhJCJaJmH sH htMhCJaJmH sH htMhhCJaJmH sH  n hjF6&(*,.02468$$If`a$gd Lf $`a$gd $ & Fa$gd & Fgd ^`gd !    ,.0fhj˿˨u^O@htMhCJaJmH sH htMh !OJQJmH sH ,j OhtMh7uCJUaJmHnHsH uFhtMhtM0JB*CJOJQJ^JaJfHmH ph333q sH htMhtMCJaJmH sH ,j ?htMh7uCJUaJmHnHsH uhtMCJaJmH sH htMhtMCJaJmH sH htMh !CJaJmH sH ,j/htMh7uCJUaJmHnHsH uThDFj..(.f.h.j.l.r.t.v.x.~..{igiU"htMh6CJH*aJmH sH h LfhCJH*aJmH sH h LfhCJaJmH sH h Lfh6CJaJmH sH ,j _htMh7uCJUaJmHnHsH uhtMhtMCJaJmH sH htMh6CJaJmH sH htMhCJaJmH sH htMhCJH*aJmH sH %8:<>@BNPRTVXZ\^`bdfhjlnf. $ & Fa$gdtM $`a$gdFftFfJp$$If`a$gd Lf-takethe nearest to f=50 Hzfrom the testdata. P0=3UfI0cos Measure thephasiccurrent whichengineuseswhen one of the cables is switched off. Turn on the engine(followpoint 3,a,b, c,instructions).Make tests forfour differentfrequencies (e.g. 10,50,90,120Hz).Measure thephasiccurrent by terminating one ofcable from theterminalB andC(pullthe plug from theB or Cterminal).Data mustbe writteninTable 2. Table 2. f, HzIf(B=0), AIf(C=0), A Change direction of the rotation, by replacing the phases. Turn onthe engine(3.a.b.points); Bypressing the button"!"andwatchingthe frequencyf in the display,change it approximatelyevery10Hzup to 120Hz; To write down motors speed n, for the current frequency 5-time press navigation button down till display shows "RPM". Then push the navy button to see the speed. Write data into table 3. Jump back to the frequency mode by pressing "navy" button to the right. Take into consideration that display shows only 3 digits. To see all digits press "navy" button to the right and left. Table 3. f, Hzn, rpm/min Draw the characteristics: I0 = f(f); n = f(f).      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