
Permanent Magnet Synchronous Motors 6-11
where
L
stk
is the stack length of the motor
S
slot
is the cross area of the slot
n
aq
is the number of conductors of the phase a within the qth slot of the stator
e PM ux linkage can be also estimated analytically as
Λ Φ
m
w
k N
=
(
6.11)
where Φ is the magnetic ux per pole, given by
Φ = B
DL
p
g
stk
π
2
(6.12)
where
B
g
is the average ux density in a pole
D is the stator inner diameter
6.3.2 Operation with d-Axis Stator Current
e d-axis current produces a ux along the d-axis. A positive d-axis current is magnetizing, increasing
the ux produced by the PM. Conversely, a negative d-axis current is demagnetizing, since ...