Danfoss VLT AQUA Drive FC 202 Programming Manual page 47

Parameter Description
Parameter 1-30 Stator This parameter gives stator winding
Resistance (Rs) resistance (R
(Line to common) 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 This parameter gives direct axis
Inductance (Ld) inductance of the PM motor. The d-
(Line to common) 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 This parameter gives back EMF across
at 1000 RPM stator terminal of PM Motor at 1000
RMS (Line to Line Value ) RPM mechanical speed specifically. It
is defined 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 specifications as between line and common
(starpoint) or between line-line. There is no general
standard. The different 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 PM motor is defined as
`Induced EMF developed across any of 2 phases of stator
winding of 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)
Rs and Ld
Illustration 3.6 Motor parameters are provided in different
formats. Danfoss frequency converters always require the line
to common value.
MG20O702
Programming Guide
) similar to Asynchronous
s
Line to line values
Rs and Ld
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Permanent magnet motors
Line to Line Back
Emf in RMS Value
at 1000 rpm
Speed (mech)
Illustration 3.7 Machine parameter definitions of Back EMF of
permanent magnet motors
1-39 Motor Poles
Range: Function:
Size [2 - Enter the number of motor poles.
related 100 ]
*
Poles ~n
n
2 2700-2880
4 1350-1450
6 700-960
Table 3.8 Pole Counts and Related
Frequencies
The table shows the number of poles for
normal speed ranges of various motor types.
Define motors designed for other frequencies
setely. 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 of
parameter 1-39 Motor Poles based on
parameter 1-23 Motor Frequency Motor
Frequency and parameter 1-25 Motor Nominal
Speed Motor Nominal Speed.
NOTICE
This parameter cannot be adjusted while the motor is
running.
1-40 Back EMF at 1000 RPM
Range: Function:
Size [ 10 - Set the nominal back EMF for the motor
related 9000 V] when running at 1000 RPM. This
*
parameter is only active when
parameter 1-10 Motor Construction is set
to PM motor [1] (Permanent Magnet
Motor).
@ 50 Hz ~n @ 60 Hz
n
3250-3460
1625-1730
840-1153
45
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