NOTE
Stator resistance (
) and d-axis
Inductance (
) values are normally,
for asynchronous motors, described in technical specifi-
cations as between line and common (starpoint). For
Permanent magnet motors they are typically described in
technical specifications as between Line-Line. PM motors
are typically built for star connection. The Stator Winding
Resistance and Induction are shown in
for
asynchronous Motor and PM Motors. The back emf of PM
motor is defined as ‘Induced emf developed across any of
two phases of stator winding of free running Motor’. The
back is express in Line to Line RMS value measured at
1000 rpm, mechanical speed of rotation. This is shown in
Asynchronous motors
Permanent magnet motors
Rs and Ld
Rs and Ld
130BC008.10
Illustration 3.2 Machine parameter definitions of asynchronous
motors and permanent magnet motors
Permanent magnet motors
130BC009.10
Line to Line Back
Emf in RMS Value
at 1000 rpm
Speed (mech)
Illustration 3.3 Machine parameter definitions of Back Emf of
permanent magnet motors
1-39 Motor Poles
Range:
Function:
Size
related
*
[2 -
100 ]
Enter the number of motor poles.
Poles ~n
n
@ 50Hz
~n
n
@60Hz
2
2700 - 2880
3250 - 3460
4
1350 - 1450
1625 - 1730
6
700 - 960
840 - 1153
The table shows the number of poles for
normal speed ranges of various motor types.
Define motors designed for other frequencies
separately. The motor pole value is always an
even number, because it refers to the total
number of poles, not pairs of poles. The
frequency converter creates the initial setting
1-39 Motor Poles
Range:
Function:
of
based on
Motor Frequency
and
Motor Nominal Speed
.
This parameter cannot be adjusted while the
motor is running.
1-40 Back EMF at 1000 RPM
Range:
Function:
Size related
*
[ 10. - 9000
V]
Set the nominal back EMF for the
motor when running at 1000 RPM.
This parameter is only active when
is set to PM
motor [1] (Permanent Magnet Motor).
3.3.5 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range:
Function:
100
%
*
[0 -
300
%]
Use this parameter along with
to obtain a different
thermal load on the motor when running at low
speed.
Enter a value which is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
Magn. current
130BA045.11
Hz
Par.1-50
Par.1-51
100%
Par.1-52
RPM
NOTE
1-50 Motor Magnetisation at Zero Speed
will not have effect
when
= [1] PM, non salient SPM.
1-51 Min Speed Normal Magnetising [RPM]
Range:
Function:
Size
related
*
[10 - 300
RPM]
Set the required speed for normal
magnetising current. If the speed is set
lower than the motor slip speed,
1-50 Motor Magnetisation at Zero Speed
and
1-51 Min Speed Normal Magnetising
are of no significance.
Use this parameter along with
1-50 Motor Magnetisation at Zero Speed
.
See
.
Parameter Description
VLT
®
HVAC Drive Programming Guide
42
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
3
3