1-36 Iron Loss Resistance (Rfe)
Range: Function:
Size
related*
[ 0 -
10000.000
Ohm]
NOTICE
This parameter cannot be
adjusted while the motor is
running.
Enter the equivalent iron loss resistance
(R
Fe
) value to compensate for iron
losses in the motor.
The R
Fe
value cannot be found by
performing an AMA.
The R
Fe
value is especially important in
torque control applications. If R
Fe
is
unknown, leave parameter 1-36 Iron
Loss Resistance (Rfe) on default setting.
1-37 d-axis Inductance (Ld)
Range: Function:
Size
related*
[0.000 -
1000.000
mH]
NOTICE
This parameter is only active
when parameter 1-10 Motor
Construction is set to [1] PM,
non-salient SPM.
Enter the value of the d-axis
inductance. Obtain the value from the
PM motor datasheet.
For asynchronous motor, stator resistance, and d-axis
inductance values are normally described in technical
specications as between line and common (startpoint).
For PM motors, they are typically described in technical
specications as between line-line. PM motors are typically
built for star connection.
Parameter 1-30 Stator
Resistance (Rs)
(line to common).
This parameter gives stator winding
resistance (R
s
) similar to asynchronous
motor stator resistance. The stator
resistance is dened for line-to-
common measurement. For line-line
data, where stator resistance is
measured between any 2 lines, divide
by 2.
Parameter 1-37 d-axis
Inductance (Ld)
(line to common).
This parameter gives direct axis
inductance of the PM motor. The d-
axis inductance is dened for phase-
to-common measurement. For line-
line data, where stator resistance is
measured between any 2 lines, divide
by 2.
Parameter 1-40 Back EMF
at 1000 RPM
RMS (line to line value).
This parameter gives back EMF across
stator terminal of PM motor at 1000
RPM mechanical speed specically. It
is dened between line-to-line and
expressed in RMS value.
Table 3.6 Parameters Related to PM Motors
NOTICE
Motor manufacturers provide values for stator resistance
(parameter 1-30 Stator Resistance (Rs)) and d-axis
inductance (parameter 1-37 d-axis Inductance (Ld)) in
technical specications as between line and common
(startpoint) or line between line. There is no general
standard. The dierent set-ups of stator winding
resistance and induction are shown in Illustration 3.6.
Danfoss frequency converters always require the line-to-
common value. The back EMF of a PM motor is dened
as induced EMF developed across any of 2 phases of
stator winding of a free-running motor. Danfoss
frequency converters always require the line-to-line RMS
value measured at 1000 RPM, mechanical speed of
rotation. This is shown in Illustration 3.7.
Line to common (starpoint)
Line-to-line values
Rs and Ld
Rs and Ld
e30bc008.12
Illustration 3.6 Stator Winding Set-ups
Parameter Description Programming Guide
MG20OB02 Danfoss A/S © 05/2018 All rights reserved. 51
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