三相异步电动机设计Word格式.docx
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三相异步电动机设计Word格式.docx
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D1'
D10141=0.2203m
Di1/D0.64
Di^D1(D^.D)=0.22/0.64=0.141m
V咤“163m
0.1412
Dh
取铁心长li-0.160m
10•气隙的确定
、=0.3(0.47..Di1Ii)10
73(0.47.0.1410.160)10”m
:
0.410"
m
于是铁心有效长度lef=lj2、=(0.16020.0004)m=0.161m
转子外径D2二-2、=(0.141-20.0004)m=0.140m
转子内径先按转轴直径:
Di2=0.048m
13.定子绕组采用单层绕组,交叉式,节距1-9,2-10,11-12
14.为了削弱齿谐波磁场的影响,转子采用斜槽,一般斜一个定子齿距
转子斜槽宽bsk=0.0130m
15.设计定子绕组
并联支路a1=1.每槽导体数Ns1=32
16.每相串联匝数Nr二叫1勺二迟兰=384
mia13"
每相串联匝数N,二山二384"
92
22
17.绕组线规设计
初选定子电密J;
=4.0Amm2,计算导线并绕根数和每根导线截面积的乘积。
NiA二丄8902.22mm2
aj14.0
其中定子电流初步估计值
选用截面积相近的铜线:
高强度漆包线,并绕根数山=2,线径d^1.18mm,
绝缘后直径d=1.25mm,截面积人广1.0936mm2,叫AC广2.1872mm2
18.设计定子槽形
乙
二[0.1402(0.80.924)10;
]’
6.71036
=5.910‘m
=6.1710^m
19.槽在面积
-138.910(m,
A二:
i(2hi2ri)
=0.0003(20.0145二0.0044)
=12.810』m2
槽满率S^^=^^F=79.4%
20.绕组系数Kp1=1
每相有效串联导体数
N:
[=Kdp1=3840.9598=368
21.设计转子槽形与转子绕组
预计转子导条电流:
'
3N^kdp13368
1»
"
90&
90右A=245・64A
其中匕=0.90由资料查出。
初步取转子导条电密Jb=3.5Amm2,
于是导条的截面积:
Ab=12=245-64mm^70.18mm2
Jb3.5
b[D22(hs21hs02)]b
bi2maxbs21
Z2
=[°
.14一2"
1.3°
+°
.恥1°
「小5“of
32
=7.8910‘m
-[D2—2(hs21+hs02+hs22)]兀-
bi2minbs22
[0.14-2(230.5)10亍j
310_m
=6.1310"
bi2-bi21
-bi2max
(bi2max
—b2min)
1
=6.1310^-(7.8910”-6.1310”)m=6.7210”m
导条截面积(转子槽面积)
Ab珂光也)hs12(bs122bs22)hs22
1553552
=()1.30()(23-1.30)m2
=96.4510^m2
估计端环电流
Z32八八
Ir=丨2=245.64A-625.5A
2叩4兀
端环所需面积
人=企二625.5mm2=297.9mm2
Jr2.1
其中端环电密Jr=0.6Jb=2.1amm2得端环所需面积为Ar=25010“m2
(二)磁路计算
22.满载电势
初设kE—;
L)=0.940
巳=0-;
L)Ung二0.940380V二357.2V
23.每极磁通
初设ks=1.25
由图3-5查得kNm"
.090
Ei
4kNmkdpifNi
Wb
357.2
41.0900.959850192
=0.00889Wb
为计算磁路各部分磁密,需先计算磁路中各部分的磁导截面
24.每极下齿部截面积
几二kFehb1Zp1=0.950.1606.0410”9=8.2610‘m2
A2=kFehb2Zp2=0.95x0.160x6.72x10」x8=8.17x10‘m2
25.定子轭部高度
h;
D1Dj2
2
二0.222°
.141_(0.814.54.4)10"
¥
10^m
=19.310“m
转子轭部高度
轭部导磁截面积
Aj1^kFeljh^=0.95^0.160汇19.3H10m2=2.934^10m2
Aj2=kFelihj2=0.95汉0.160汉22.5汉10"
m2=3.42汉10”m2
26.—极下空气隙截面积
A,」ef=0.1110.163m=0.01809m2
27.波幅系数
28.
—=1.47
Bavap0.68
气隙磁密计算
转子齿部磁密
31.从D23磁化曲线找出对应上述磁密的磁场强度:
Hi1=32.6AcmHi2=37.8Acm
32.有效气隙长度
、ef=k=1.0250.410‘m=0.4110”m
其中气隙系数为
k_讯440.75b°
1)
;
1h(440.75b°
1)七1
0.0123汉(4.4汉0.4汉10°
+0.75汉3.5汉10,)
k.=k1kd=1.0231.0025=1.025
33.齿部磁路计算长度
34.
Li1小1h21)1r21
Li2=(02h22)—Q
=14.54.4m=15.9710^m
35.轭部磁路计算长度
36.气隙磁压降
37.齿部磁压降
=巴丄祁=32.6x102x15.97x10」A=52.06A
F2=Hi2Li2=23"
02汉37.8"
0」A=86.94A
38.饱和系数
ks二
F^+F^+Fi2235.57+52.06+86.941258
235.57
误差J.258-仁5=0.63%“%,合格
1.258
39.定子轭部磁密
hj1
Fj1
41.轭部磁压降:
其中轭部磁位降校正系数由资料的附图查出
193x10'
■^心74,片/仙于是C”"
410
=Cj1Hj1L'
j^0.41015.510278.81103=50.08A
42.每极磁势
Fi1-Fi2-Fj1-Fj2
=(22.74133.8654.5150.088.99)A
=374.85A
43.满载磁化电流:
44.
磁化电流标么值
45.励磁电抗
mi,(Mkdp1)lkspJ
4500.4二10“3(1920.9598)20.1670.111.1
-1.25820.4110"
=146.46门
Xms二Xms
1kW
Un:
』
二便心罕2.536
380
(三)参数计算
46.线圈平均半匝长
单层线圈
lc=IbKey=0.195+1.2X0.09929=0.314m
l^lt2d,=0.165+2X0.015=0.195m
ty=i'
.[Dii■2(hci■hn)■h?
i■Di],,-'
/2p
=n[0.141+2(0.8+0.924)+(14.5-0.924)X10-3+4.4X10-3]■:
/2X2
=99.29X10-3m
节距比2/3<
-<
1,取]=0.8
其中d1是线圈直线部分伸出铁心的长度,取10~30mm
kc是经验系数取1.2
47.单层线圈端部平均长
lE=24Key=2X0.015+1.2X0.0993=0.150m
48.漏抗系数
^=4和0(口心1)鴛卩"
/耳卩2"
2
=4X二X50X0.4二X10-7(0.9598X192)2X0.163X7.5X10-3/3X2X3802
=0.03787
49.定子槽比漏磁导
s^=Ku1'
u1'
KL1'
L1
=1X0.410+1X0.830
=1.24
ah01丄2h11
u1:
b01(bo1+bn)
0.820.924
=
3.53.56.7
=0.410
因虹』45-°
.924)*543
2r2124.4
bii
2r21
6.7
=0.76
24.4
其中Kii=K_i=1
50.定子槽漏抗
=2汉3汉2汽O.iGO^iNA汉CX
=360.95982O.i63
=0.440CX
5i.定子谐波漏抗
=3>
<
0.111x0.009Cx
2_32
-0.41100.95981.368
=0.5877CX
其中'
S=0.009
52.定子端部漏抗
单层交叉式绕组的端部漏抗与分组的单层同心式绕组相近贝
*0.47(Ie-0.6仁心
XE12
Kdp11ef
=0.47(0.150-0.64江0.0993)Cx
0.163汉0.95982
=0.270C
53.定子漏抗
X十Xsi*X、1*Xei*
=(0.440+0.5877+0.27)CX
=0.0491
54.转子槽比漏磁导
s2二’u2_'
”L2=°
.51.73=2.23
h020.5
2h12
(b02bi2)…l
21.30
(15.5)1.330
=1.73
h/b2=7.6,b〃b2=1.83
查表得入l=1.330
55.转子槽漏抗
Xs2
2miplt2'
s1CX
乙lef
=2>
3x0.160x2.23Cx
320.163
=0.821CX
56.转子谐波漏抗
二RCx
Ks
_30.1110.0150Cx
2-3
■:
0.4110
=0.9023CX
查表得vR=0.015
57.转子端部漏抗
*l举—lt2DRCX、,*
Xe2=0.757(条R)xXe2
1.132plef
=0.757P132Cx
0.163汉4
=0.150CX
58.转子斜槽漏抗
Xsk*=0.5(bsk^)X2*
=O.5(°
.°
1%.o161)299O23Cx
=0.29G
59•转子漏抗
*****
X「2=Xs2X,Xe2Xsk
=(0.821+0.9023+0.15+0.29)CX
=2.1633C
=0.0819
60.总漏抗
***
X十X匚2
=0.131
61.定子直流电阻
R='
2N1lc
R1
Nt1AcV'
1
£
=0.0217汶10疋2疋192>
0.314
1.05
式中C为考虑导线绝缘和引线重量的系数,漆包圆铜线取
:
为导线密度
硅钢片重量
Ge=Kfeh(DIJ氓
=0.95X0.163X(0.22+0.005)2X7.8X10-3
=61.897kg
式中「•为冲剪余量,取5X10-3m
64•转子电阻
导条电阻折算值
,:
■KBLB4m1(N1Kdp1)2
RB=—
Ab乙
0.043410启1.040.19543(1920.9598)2
96.4510“32
=1.162'
式中Kb是叠片不整齐造成导条电阻增加的系数端环电阻折算值
,「DrZ2g(N1Kdp1)2
RR=厂
2叩ARZ2
_62
0.043410320.13243(1920.9598)
2汉3.14汇4汉250汽10厘汉32
=0.03716门
导条电阻标幺值
*
Rb=
端环电阻标幺值
RR=
RrI
KW
=0.3716^6.58
=380
=0.00643
转子电阻标么值
R2=RB+Rk=0.02655
(四)工作性能计算
65•满载时定子电流有功分量标么值
66•满载时转子电流无功分量标么值
***2**2
Ix=TX厂1ip[1+(GX.IIp)[
=1.0216X0.13944X(1.1236)X[1+(1.0216X0.1394X1.1236)]
=0.181
码=1+xy*=1+0.049篦536=1.0216
67•满载时定子电流无功分量标么值
I1Q=1m+Ix=0.469+0.143=0.65
68满载电势标么值
I^E=1—^l
=1-(ijR*+11Q*Xj)
=1-(1.1236X0.0207+0.65X0.0491)
=0.942
与22项初设值Ke相符
69.空载时电势标么值
1-;
0=1—Im*X1*=1-0.309X0.0419=0.976
70.空载时定子齿磁密
B10=(=T)Bt1=(°
97%.加?
)“58=1.637T
71.空载时转子齿磁密
B20=(—^)Bt2珂0976)1.60=1.658T
1-;
L0.942
72空载时定子轭磁密
Bj1Q=(^L)Bi^(-0j976)1.45=1.502T
l0.942
73.空载时转子轭磁密
B2o=(L」)Bj2之0976)1.242=1.287T
1-®
74.空载时气隙磁密
Bo=(
L
0.976
0.942)
x0.722=0.748T
・0邛宀
•一0
80.空载总磁压降
Fj10
Fj20F0
75.空载时定子齿部磁压降
23
Ft10=H10Lt1=46.8X10X15.97X10-=74.74A
76.空载时转子齿部磁压降
Ft2o=H2oLt2=53.4X102X23X10-3=122.82A
77.空载时定子轭部磁压降
Fj1o=GH1oLj1=O.4OX20.1X102X78.81X10-3=63.36A
78.空载时转子轭部磁压降
Fj20=C2H2°
Lj2=0.43X8.90X102X27.69X10-3=10.597A
79.空气隙磁压降
=244.05A
1.0250.7480.410’
0.4二10^
=74.74+122.82+63.36+10.597+244.05
=504.97A
81.空载磁化电流
_2pF00
0.9
二2汇2汉504.97
0.931920.9598
=4.06A
82.定子电流标么值
i1=.(I*21p—I*21Q)=•(1.12362—。
.652)=1.249
定子电流实际值
=|乙=1.249X6.58=8.51A
83.定子电流密度
1l
a1Nt1Ac1
8.51
11.0936
-3.89A
2mm
84.线负荷
85.转子电流标么值
=.(1.12362一0.18432)
=1.139
转子电流实际值
12=12Ikw
.1396.58
33840.9598
=258.96A
端环电流实际值
I2Z2
258.9632
23.142
=659.4A
86.转子电流密度
导条电密
258.96
96.45
端环电密
=2.685A
Ir_659.4
Ar250
=2.64A
mm2
87.定子电气损耗
**2*2
pcu1R=1.294x0.0207=0.0347
PCu^Pcu1Pn=0.0347x7.5x103=260.25W
88.转子电气损耗
PAl2=l2R2=1.139x0.02655=0.0344
*3
Pai2=Pai2Pn=0.0344x7.5x10=258W
89.附加损耗
铜条转子
Ps*=0.02
Ps=PsPn=0.02x7.5x103=150W
90.机械损耗
二级封闭自扇冷式
Pfw=(3/p)2(D1)4x104=(3/2)2x(0.22)4x104=52.7W
机械损耗标么值
*q
Pfw=Pfw/Pn=52.7/7.5x10=0.00703
91.定子铁耗
(1)定子轭重量
G=4pALt1;
\e=4x2x2.934x10-3x78.81x10-3x7.8x103=14.43kg
(2)定子齿重量
G=2pALj1'
「Fe=4x2x8.26x10-x15.97x10-x7.8x10=4.116kg
(3)损耗系数
Phet=6.8Phej=5.1
(4)定子齿损耗
Pret=K1PhetGt=2x5.10x14.43=147.2W
(5)定子轭损耗
PFe=KPhejG=2.5x6.80x4.116=69.97W
(6)定子铁耗
PFe=PFet+卩尸列=147.2+69.97=217.17W
对于半闭口槽按经验取
Ki=2K2=2.5
铁耗标么值
PFe=PfJPn=217.17/7.5X10=0.029
92.总损耗标么值
******艺p=Pcu1+P\l2+Pw+R+PFe
=0.0347+0.0344+0.02+0.00703+0.029
=0.1251
93.输出功率
Pn;
=1+艺「=1+0.1251=1.1251
94.效率
=1-艺p*/Pn1*=1-0.1251/1.1251=0.869%
(87%—86.9%)/87%=0.115%<
0.5%
95.功率因数
cos=IJ/1;
=1.1249/1.294=0.87
96.转差率
1-PAl2
=0.0344
1+0.0344+0.02+0.0154+0.007
=0.0319
=(1—0.5)勺47.2+(1—0.4)X69.97
98.最大转矩倍数
1-Sn
*■'
*2*2
2(Ri+U(R+X§
))
1-0.0319
2(0.0207,(0.020720.1312))
=2.74
(5)起动性能计算
99.起动电流假设值
Ist'
=(2.5~3.5)Tm*Ikw=3X3.157X6.58=59.1A
100.起动时定转子槽磁势平均值
Fst=1st'
(NWa1)0.707[心+心2心(Z1/Z2)].(1二。
)
=59.1X32X0.707X[1+0.95982X1X(36/32)]X.0.976
=2836.5A
101空气隙中漏磁场的虚拟磁密
B-=卩0Fst/2C
=0.4nX10-6X2836.5/2X0.4X10-3X0.9367=4.757T
■-C=0.64+2.5
=0.64+2.5—0.4
\'
12.3十16.1
=0.9367
由Bl查得漏抗饱和系数KZ=0.44
102齿顶漏磁饱和引起的定子齿顶宽度的减少
CS1=(11一bd)(1一&
=(12.3-3.5)X(1-0.44)
-3
=4.93X10m
103.齿顶漏磁饱和引起的转子齿顶宽度的减少
Cs2=(t2一bo2)(1—艮)
=(16.1-1)X(1-0.44)
=8.456X10-3m
104.起动时定子槽比漏磁导
S1(St)=Ku1(入u1一心丸u1)+Kj丸L1
=(0.410-0.185)+0.83
=1.055
(
0.58h11
L)(
CS1
Cs11.5b01
0.80.58
0.924
)(
4.93
4.931.53.5
=0.185
=(1.055/1.24)X0.440G
=0.3743CX
106.起动时定子谐波漏抗
=0.44X0.5877Cx
=0.2586CX
107.起动时定子漏抗
****
X1(st)=Xsl(st)+X3l(st)+Xei
=(0.3743
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