Induction Motor Starting Parameters
Induction Motor Starting Parameters
Induction Motor Starting Parameters
Symposium
INFOTEH – JAHORINA 2016
16 – 18 March 2016
Induction Motors
• Wye-delta starting
• Stator resistance starting
• Autotransformer starting
• Soft starting
Torque – Speed Curves
Končar VAAZ A 800-A L260L720 M100B14P0,9 fan: Pn=1.05 kW, nn=720 min-1
Končar 5AZ 100LB-8 motor. Mk=36.01 [Nm] Sever ZK 100 Ld-8 motor. Mk=33.98 [Nm]
Pn=1.1 kW
Motor Ip/In Mn [Nm] Mp/Mn Mk/Mn Jm[kgm2] m [kg]
Končar 3.7 15 2.1 2.4 0.0104248 23
Sever 3.5 15.5 2 2.2 0.0127 34.6
Starting Time Calculation
Torque equilibrium
d
Mm Ms Md Ms J
dt
2M k
Mm
s sk
sk s
2
n
M s M sn
nn
n0
mD 2
tp
0
38,2M m M s
dn
Starting Time Calculation
Simpson’s 3/8 rule for numeric integration :
-based upon a cubic interpolation
-twice as accurate as the standard parabolic method
• Duty cycle S1
• Totally enclosed and fan cooled motors
• Insulation class F -> allowed temperature 100 oC
Conclusion