1-35 Main Reactance (Xh)
Range:
Function:
Size
related
*
[ 0.0 -
999.9
Ohm]
Set the main reactance of the motor using
1 of these methods:
•
Run an AMA on a cold motor. The
frequency converter measures the
value from the motor.
•
Enter the X
h
value manually.
Obtain the value from the motor
supplier.
•
Use the X
h
default setting. The
frequency converter establishes
the setting based on the motor
nameplate data.
1-37 d-axis Inductance (Ld)
Range:
Function:
Size
related
*
[ 0 -
1000 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
specifications as between line and common (startpoint).
For PM motors, they are typically described in technical
specifications 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 defined 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 defined 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 specifically. It
is defined between line-to-line and
expressed in RMS value.
Table 4.3 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 specifications as between line and common
(startpoint) or line between line. There is no general
standard. The different set-ups of stator winding
resistance and induction are shown in
.
Danfoss frequency converters always require the line-to-
common value. The back EMF of a PM motor is defined
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
).
Line to common (starpoint)
Line to line values
Rs and Ld
Rs and Ld
130BC008.11
Illustration 4.2 Stator Winding Set-ups
Permanent magnet motors
130BC009.10
Line to Line Back
Emf in RMS Value
at 1000 rpm
Speed (mech)
Illustration 4.3 Machine Parameter Definitions of Back EMF of
PM Motors
1-38 q-axis Inductance (Lq)
Range:
Function:
Size
related
*
[ 0.000 -
1000 mH]
Set the value of the q-axis
inductance. Obtain the value from
the permanent magnet motor
datasheet. The value cannot be
changed when the motor is running.
1-39 Motor Poles
Range:
Function:
Size
related
*
[2 -
100 ]
NOTICE
This parameter cannot be adjusted
while the motor runs.
Enter the number of motor poles.
Parameters
Programming Guide
MG03N202
Danfoss A/S © 11/2015 All rights reserved.
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