Fig. 3-26 Equivalent Circuit Diagram (Ecd); Motor Data Identification - Siemens MICROMASTER 440 Operating Instructions Manual

Issue 10/06
3.5.5

Motor data identification

MICROMASTER has a measuring technique which is used to determine the motor
parameters:
Equivalent circuit data (ECD, refer to Fig. 3-26) → P1910 = 1
Magnetizing characteristic (refer to Fig. 3-27)
For control-related reasons, we absolutely recommend that the motor data
identification is carried-out as, starting from the rating plate data, it is only possible
to estimate the equivalent circuit data, the motor cable resistance, the IGBT let-
through voltage and the compensation of IGBT interlocking times. For example, the
stator resistance is extremely important for the stability of the closed-loop Vector
control and for the voltage boost for the V/f characteristic. The motor data
identification routine should be executed, especially if long feeder cables or if third-
party motors are being used.
If the motor data identification routine is being started for the first time, then the
following data (refer to Fig. 3-26) is determined, starting from the rating plate data
(rated [nominal] data) with P1910 = 1:
Equivalent circuit data
Motor cable resistance
IGBT on-state voltage and compensation of IGBT gating dead times
The rating plate data represent the initialization values for the identification. This is
the reason that it is necessary to have correct and consistent input of the rating
plate data when determining the data specified above (refer to Section 3.5.8).
On-state voltage
0.0 ... 20.0 [V]
P1825 (1.4)
Fig. 3-26
In addition to the equivalent circuit data, the motor magnetizing characteristic (refer
to Fig. 3-26) can be determined using the motor data identification (P1910 = 3). If
the motor-drive inverter combination is operated in the field-weakening range, then
this characteristic should be determined, especially when Vector control is being
used. As a result of this magnetizing characteristic, MICROMASTER can, in the
field-weakening range, more precisely calculate the current which is generating the
field and in turn achieve a higher torque accuracy.
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
Inverter Cable
P0350 = 2(R
Gating dead time
Cable resistance
0.00 ... 3.50 [us]
0.0 ... 120.0 [Ohm]
P1828 (0.50)
P0352.D (0.0)
R
Cable
C
Cable
Equivalent circuit diagram (ECD)
→ P1910 = 3
Stator res. (L2L)
0.00001 ... 2000.00000 [Ohm]
P0350.D (4.00000)
+ R )
Cable
S
Stator leak.induct
0.00001 ... 1000.00000
P0356.D (10.00000)
R L
S ?S
Main inductance
0.0 ... 3000.0
P0360.D (10.0)
3 Functions
Motor
Rotor leak.induct.
0.0 ... 1000.0
P0358.D (10.0)
Rotor resistance
0.0 ... 300.0 [Ohm]
P0354.D (10.0)
L
R
?R
R
L
M
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