直流油泵计算书
直流油泵电机(EOP )计算书
电机数据清单列表(Motor Data Sheet):
电机电抗
Ra =Ra1 + Ra2 + Ra3=0.0631 + 0.0272 + 0.00538 = 0.09568Ω
GD 2= 电机转矩 + 负载转抗 = 4.6 kgf.m2——————MHI Check
Tn = =
额定功率15000
==79.59N .m
0.1047⨯额定转速0.1047⨯1800
转矩常数:
KT=
Tn 79.59
==0.97N .m
额定电流I 82
电压常数:
额定电压(v )-电机电抗(R)⨯额定电流(I)220-0.09568⨯82KE ===0.1179V /rpm
额定转速(N)1800
所需串联阻抗段数:
log n =
V 220log
==3.8段 log log
I b 82
起动串接阻抗计算:
I b ÷Im =82÷164=0.5 R 1=V ÷I =220÷164=1.34 R 2=R 1⨯0. =1.345⨯0.5=0.67 R 3=R 2⨯0.5=0.67÷0.5=0.335 R 4=R 3⨯0.5=0.335÷0.5=0.1675
起动电抗器r1,r2,r3, r4的计算: r 1=R 1-R 2=1.34-0.67=0.67
r 2=R 2-R 3=0.67-0.335=0.335 r 3=R 3-R 4=0.335-0.1675=0.1675 r 4=R 4-Ra =0.1675-0.09568=0.07182
起动时间的计算:1kgf . m =9.8N . m
t 1段内,经查表得负荷转矩为2.12kgf . m
P 1=1.027⨯2.12⨯1800⨯0.5=1959.52W
IL 1=82⨯P 1÷15000=10.712A
t 2段内,经查表得负荷转矩为4.49kgf . m
P 2=1.027⨯4.49⨯1800⨯0.75=6225.16W
IL 2=82⨯P 2÷15000=34.03A
t 3段内,经查表得负荷转矩为5.91kgf . m
P 3=1.027⨯5.91⨯1800⨯0.875=9559.573W
IL 3=82⨯P 3÷15000=52.259A
t 4段内,经查表得负荷转矩为7.0224kgf . m
P 4=1.027⨯7.0224⨯1800⨯0.9375=12170.26W IL 4=82⨯P 4÷15000=66.53A
t 5段内,经查表得负荷转矩为7.908kgf . m
P 5=1.027⨯7.908⨯1800⨯1=14619.03W
IL 5=82⨯P 5÷15000=79.917A
起动时间的计算:
GD 2Im -Ili
tn =Rn ⨯⨯ln (s )
38.2⨯KT ⨯KE Ib -Ili
4.6164-10.712
⨯ln =1.08s
38.2⨯0.97⨯0.117982-10.712
4.6164-34.03
t 2=0.67⨯⨯ln =0.70s
38.2⨯0.97⨯0.117982-34.03
4.6164-52.259
t 3=0.335⨯⨯ln =0.47s
38.2⨯0.97⨯0.117982-52.259
4.6164-66.53
t 4=0.1675⨯⨯ln =0.32s
38.2⨯0.97⨯0.117982-66.53t 1=1.34⨯
t 5=0.09568⨯
4.6164-79.92
⨯ln =0.37s
38.2⨯0.97⨯0.117982-79.92
起动时间 2.94s
励磁阻抗部分的计算:
R f 0=分励电抗(Rf ) +可变电抗(VR)+固定电抗(FR)
R f 0=
V 220==148.15Ω I f 1.35
Rf 0在±10%内变化,变化范围为:
(R f 0⨯1.1)-(R f 0⨯0.9)=29.63Ω
可变电抗: VR =0 60Ω内变化 固定电抗 FR 的大小为:
FR =R f 0-R f -VR =148.15-69.2-60=18.95Ω