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Power Electronics and Motor Drives
book

Power Electronics and Motor Drives

by Bogdan M. Wilamowski, J. David Irwin
October 2018
Intermediate to advanced content levelIntermediate to advanced
1015 pages
40h 24m
English
CRC Press
Content preview from Power Electronics and Motor Drives
Induction Motor 4-11
function of the slip is as a power splitter of the transmitted power, P
T
, between the rotor joule losses, P
jr
,
a
nd the converted mechanical power, P
mech
.
4.2.1 Starting Torque and Current
Imposing in the torque relation a slip equal to one, the starting torque value can be obtained as
T
p
V
R
R R X X
start
s
eq
r
eq r eq lr
=
+ + +
3
2
2 2
ω
( ) ( )
(
4.33)
In the same way, the starting current can be determined by
I
V
R R X X
start
eq
eq r eq lr
=
+ + +( ) ( )
2 2
(4.34)
e denominator of the previous relation is the short circuit impedance, oen dened as locked rotor
impedance. It is evident that the starting current corresponds to the locked
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Publisher Resources

ISBN: 9781439802861