53727電力拖動基礎(chǔ)部分習(xí)題解答

（1）以速度v0.3ms提升重物時，負(fù)載（GG0）轉(zhuǎn)矩TL、卷筒轉(zhuǎn)速nL、PL及電動機(jī)的轉(zhuǎn)速nd。v

60v

0.311.465r/nndiiin12Lndi1i2i3nL33.5411.465481.5r/電動機(jī)的角速度2nd2481.550.4rad m負(fù)載轉(zhuǎn)矩T'GGD1900490000.5m T T

mTLL mj (j1j2j3)(123 42jj1j2j333.54c1230.950.950.95mL或T9.55(G0G)v9.55(190049000)0.3mL

481.5PLTLd353.5350.417818WL折算到電動機(jī)軸上的系統(tǒng)總飛輪矩GD2及負(fù)載轉(zhuǎn)矩La①旋轉(zhuǎn)部分飛輪矩aGD2

GD2

GD2GD2GD2 3 (Z/Z (Z/Z)2(Z/Z (Z/Z)2(Z/Z)2(Z/Z 2308.340.2519.5

56.8(55/30)2(64/

(55/30)2(64/38)2(75/②GG1G2147009800③v45m/min0.75m/④6的轉(zhuǎn)速n6

0.02

30r/⑤電動機(jī)的轉(zhuǎn)速n

z6

z230756455231.58r/ z5z3

b⑥直線運動部分的飛輪矩bbb

n2nd

24500

⑦總飛輪矩 GD2GD2GD2268.2493.79 ⑧f(G1G2)(147009800)0.1⑨折算到電動機(jī)軸上的負(fù)載轉(zhuǎn)矩mLT9.55(Ff)v9.55(98002450)0.75mL

231.58PT

473.62231.5811479W L

2C UNIaNRa220280.35n nN

CTN9.55CeN9.550.21 T0時，nUN 2201047.6r/ Ce mnnN1000rmin時，TeNCTNIaN2.0128mR

50%IN

50%2203.93Te0n01047.6rT

nUN

RaR

C CC2 e2200.353.93 0.211047.62N電樞電壓U'50%UNNU' 50%220N U

CTe0n0C

523.81r/minU n IaNC CC e TeTeN

110

0.21523.81500.59r/磁通'80%NT0時，n''UN UN C C Te時，I'CTTe

CT C

80%C nUN IC C'C UN80%Ce

80%CeN

0.8 0.80.210.81264.2r/C UNIaNRa220nN nNCTN9.55CeN9.55 T0nU

1103.86r/Ce

nnN1000r/min時，TeNCTNIaN a轉(zhuǎn)速n'1100rminIaE'Cn0. U aI' a a 電壓U'降至200V,電樞電流I'' 115A時的轉(zhuǎn)速 aE''U'I''R2001150.8 a n'' a 899.6r/Ce 直接起動的起動IC UNIaNRa11018.50.5n nN

110220 I2I，采用降壓起動時，所需的U U'IR2I

218.50.5st N

I

2

0.5 I12IN253106AmRm

2202.075m3m3計算I2并校核其是否合II1106 1.1IN1.15358.3A;1.2IN1.2531.1IN<I2<1.2INI2R1Ra1.740.394aa23R2RRaa23

1.7420.394Rst1R1Ra0.6860.3940.292Rst2R2R11.1940.6860.508Rst3R3R22.0771.194C UNINRa220530.394n nN

①R3n

UNI2R322060.92.077469.9r/ C C

②R2nEa

UNI2R222060.91.194740.2r/ C C

③R1n

UNI2R122060.90.686895.5r/ C C

初選最大起動電流I1和切換II12IN2378756I21.15IN1.15378434.7

R1UNINPN122037874000I2N I2NmRm

2200.291確定起動級數(shù)lg

lg0.0323.995mm4m4校核III1

1.1IN<I2<1.2INI2R1Ra1.7370.032aaa234R2RR3RR4aaa234

1.73720.0321.73730.0321.73740.032Rst1R1Ra0.05560.0320.0236Rst2R2R10.09650.05560.0405Rst3R3R20.16770.09650.0712Rst4R4R30.29130.1677EaNUNIaNRa4402500.078420.5V

2IN

2

0.078R'R

UN2IN

440420.50.0782電動機(jī)以n'800rminC UNINRa220950.18n nN

E'Cn'0.203800 E R aR 0.18IN INR=2時，電動機(jī)的穩(wěn)定轉(zhuǎn)速EE

Ra)95(20.18)UE 0n'' a 1020.2r/Ce 若以n'''1200rmin E'''Cn''0.2031200 ①能耗制動運行時，RaR 0.18IN INE'' 243.6②反向回饋制動運行時，R NR 0.18IN IN 220③轉(zhuǎn)速反向的反接制動運行時，R aR 0.18IN INT0.8TI'

0.810382.4 C UNIaNRa2201030.2n nN

吊起重物后，停在空中n'0a采用在電樞回路串電阻調(diào)速，當(dāng)n'0E'a R aR 0.2Ia IaNn''510rmin，電樞反接U''N

I''

E''Cn''0.399 U''R a

220203.490.2I Ia

穩(wěn)定時的轉(zhuǎn)速 穩(wěn)定時，I''' E''U'I'''(RR)220(82.4)(0.21.856) E

n''' a 126r/Ce R0.5II時的轉(zhuǎn)速 C UNIaNRa2203200.5n nN

E'U (RR)0320(0.50.05) E n' a 862.7r/Ce

a

，

0時的轉(zhuǎn)速E''U

2203200.05 aNE

n'' a 1156.9r/Ce 上述兩種情況下，電動機(jī)的輸入功率P1和軸上輸出功率U0P10mIaIaN時，TeNCTNIaN9.55CeNIaN9.550.204320mP

'

623.42862.756290W

P1UNIaN22032070400WP

''

623.421156.975486.8W

C UNIaNRa220540.35n nN

n0

UNCe

3283.6r/nNn0nN3283.63000283.6r/

283.61418r/minnminn0minnN1418283.61134.4r/D

nN

D

3000

283.6(1 0 n' 0

0.23283.6656.7r/D

n0

3283.6

D

3000

656.7(1調(diào)速范圍D

1200低速下工作時的電源電壓UC UNIaNRa440760.4n nN

n0

UNCe

4401073r/minnNn0nN1073100073r/n0minnminnN40073473r/ U'C

0.41473最低轉(zhuǎn)速機(jī)械特性的靜差率n0

0.154（1）'1時，穩(wěn)定轉(zhuǎn)速nI C UNIaNRa2202100.08n nN

是常數(shù)IC' I'CTNIT C T

CT1C

IaN

32106303 I'

I'

n aa aa 1251.97r/eCe

1C

1n'n,In'n,I

,D=5時，采用調(diào)壓調(diào)速時的最低轉(zhuǎn)速nmin和低速時的C UNIaNRa2201000.25n nN

n0

UNCe

2201692.3r/minnNn0nN1692.31500192.3r/

1500300r/ n0minnminnN300192.3492.3r/n0

192.30.39125%，采用調(diào)壓調(diào)速時的最低轉(zhuǎn)速nmin

192.3769.2r/minnminn0minnN769.2192.3576.9r/D

nN

C UNIaN

110100.1n nN

TCICKI f負(fù)載轉(zhuǎn)矩增大為原來的4倍，則I' 20A；'2 I' 110210n' aa aNa 495.4r/C

2C

2 3額定轉(zhuǎn)矩n60fN

60501000r/minNsnsN

10009602

21000104.67rad/

2

T m1

U1

2202

smm

R2)(R

))

(2.06

)2(3.13最大轉(zhuǎn)矩 U 1

2[R R2( X

)2m m 2[2.06 2.062 2[2.06 2.062(3.134.27)2]

過載能力mTmaxm

R2(1 R2(1 X2.062(3.13mn60fN

60501500r/minNsnsN

15001460m mTNN 2 ss( 21)0.0267(2.8

2.821) mTmaxmTN2.8490.58mT

2

eT(22sm)Tmax(220.145)1373.6e

mssm m

0.1452

0.145

n60fN

60501500r/min2

21500157rad/ U2

2202Tst1 1 (RR')2( X' (0.0140.014)2(0.065m m(R(RR')2( X

R' U2(R'R'T1 (RR'R')2( X'

3

2202(0.014 m (0.0140.0140.12)2(0.065m(R(RR'R')2( X(0.0140.0140.12)2(0.065

Xst U2T1 1 (RR')2( XX' 3

2202 m (0.0140.014)2(0.0650.12m

Ist

(RR(RR')2( XX(0.0140.014)2(0.0650.12NT9550N

9550

mmmm

Ist1

;IstKIIN658348A；TstKTTN1.1183.78202.158NmIstIstYI'1I 3

13483mT'1T1202.158m 3 T'T' Ist1T

(Ist1

( T'T' I'0.552I0.552K IT'0.552T0.552 T'T' I'0.642I0.642K IT'0.642T0.642 I' ,TI' ③73%I'0.732I0.732K II'I' n60

6050750r/minNsnsN0.0330.0333

7507253I22RsN3I22

TmaxmTNTL0.75TN；2TL20.75TN1.5TN0.85Tmax0.852.2TN1.87TN取T1m4m4TT1

1.1TL1.10.75TNR21R21.680.067 2R1.6820.067 3R1.6830.067 4R1.6840.067 Rst1R21R20.1130.0670.046Rst2R22R210.1890.1130.076Rst3R23R220.3180.1890.129Rst4R24R230.5340.318PesNnN和n60

60501500r/min2

21500157rad/ PeP2pcu2pp150000220526451010155860WsN

pcu2

nN(1sN)sN(10.0141)15001479r/Te

155860mmTR'sn cu R'Te常數(shù)2 R' 0.013R'Ns R'N2

n(1s)sN(10.0141)pcu2sPe0.1226155860R2(1 R2(1 XmR'R'R2(1 R2(1 Xm欲使TstTmaxsmR'所以令sm R2(R2(1 XR2(1R2(1 XR20.0132(0.060.0132(0.06重物以8m/min的速度上升時，電動機(jī)的轉(zhuǎn)速n835.4r/min212.4r/同步轉(zhuǎn)速

60p

6050600r/min

ns

600577snsn600212.4 0.0380.03833I22RsN3I22

R(s

(0.6461)0.03470.5552n60

60501000r/minNsnsN

10009763I22RsN3I22

0.0240.02431NsR2R11N

0.01570.050.0242NsR2R22N3sR2R33

0.01570.10.0240.01570.20.024R2 R2n1(1s1)ns(10.1004)1000899.6r/minn2(1s2)ns(10.1769)1000823.1r/minn3(1s3)ns(10.3297)1000670.3r/1D12D23D3

1nsn11000899.61 nsn21000823.123

n31000670.3 提升重物時電動機(jī)的轉(zhuǎn)速n60

60501000r/minNsnsNmm

1000960NT9550N

9550

mTmaxmTN2.5596.9mss( 21) eT e

2 s s 將TeTL530Nms10.035s21.045（舍去n(1s1)ns(10.035)1000n'280rminn 1000s' R''(sR'

(3

1)0.0213I23I2

sNE2

n''0n''0s''

(

(

4I12IN230A，I21.15IL1.150.8INI1

2IN

RamRm

2202IN

2

lg

0.10.981 m33修正33II1

N

R1Ra2.1240.1aa23R2RRaa23

2.12420.12.12430.1Rst1R1Ra0.2120.10.112Rst2R2R10.4510.2120.239Rst3R3R20.9580.451C UNIaNRa2201150.1n nN

CTN9.55CeN9.550.2128CC2CC 0.21282.032e IL0.8IN0.8115lnI1

230

ln8.451I2

108.33 GD2 e 375CC e CC 64.7CC2e GD2

e 375CC e GD2 e 375CC e t T)lnI1

m

I21.38C UNIaNRa22031 n nN

CTN9.55CeN制動初始轉(zhuǎn)速UnQ UC

C

C EaCeNnQ0.20761012R

210.09