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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
Noise and Vibrations of Electrical Rotating Machines 9-21
h iN i
r r
= + = ± ± ± ±1 0( , , , , ),1 2 3 4
(
9.45)
I
r
1
is the rms value of the rotor fundamental current, varying with the load and Arg(Z
_
1
) its phase angle.
Equation 9.45 shows that the number of rotor bars has an inuence on the cage rotor harmonic exis-
tence, so a good choice of the slot number is very important to avoid magnetic noise [25,26]. For exam-
ple,
i
f
t
he
n
umber
o
f
r
otor
b
ars
i
s
3
4
w
ith
p
=
2
,
t
he
r
anks
h
r
of the rst rotor harmonic are −16 and 18.
ey will interfere with the stator harmonics −17 and 19 and create force waves with a mode number 2,
as shown in (9.6).
9.5.3. ...
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Publisher Resources

ISBN: 9781439802861