Further Motor Parameters; Stator Resistance; Leakage Coefficient - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

10.2

Further motor parameters

In particular the field-oriented control requires the determination of further data
which cannot be read off the rating plate of the 3-phase machine for the precise
calculation of the machine model. In the course of the guided commissioning, the
parameter identification was carried out to measure the further motor parameters.

10.2.1 Stator Resistance

The resistance of the stator winding is measured during the guided commissioning.
The measured value is saved as a phase value in parameter
and is 3 times smaller than the winding resistance in delta connection.
By default, the equivalent stator resistance of a standard motor is entered to match
the reference output of the frequency inverter.
No.
377 Stator resistance
1190 Stator resistance
1)
Available in configurations 1xx, 2xx, 4xx (Parameter
2)
Available in configurations 5xx and 6xx (Parameter
Stator resistance asynchronous motor:
The value of the stator resistance can be optimized while the machine is in no-load
operation. At the stationary operating point, the torque-forming current
and/or the estimated
dependent of the stator resistance, the adjustment should be done at a winding tem-
perature which is also reached during normal operation.
A correct measurement will optimize the control functions.
Stator resistance asynchronous motor:
The value of the stator resistance of the synchronous motor is entered during the
guided commissioning. The value of the stator resistance is used for adjustments of
the current controller and should be therefore entered as exact as possible. The
tor resistance
from the data sheet of the motor.

10.2.2 Leakage Coefficient

The leakage coefficient of the machine defines the ratio of the leakage inductivity to
the main inductivity. The torque and flux-forming current components are thus cou-
pled via the leakage coefficient. Optimization of the leakage coefficient within the
field-orientated control systems demands acceleration to various operating points of
the drive. Unlike the torque-forming current
215 should be largely independent of the load torque. The flow-forming current
component is inversely proportional to the leakage coefficient. If the leakage coeffi-
cient is increased, the torque-forming current increases and the flux-forming compo-
nent drops. The adjustment should result in a relatively constant actual current
215, matching the set
drive.
The sensorless control system uses the parameter
to optimize the synchronization to one drive.
No.
378 Leakage Coefficient
124
Parameter
Description
1)
2)
214 should be zero. Due to the temperature-
Active current
1190 is the value between two motor phases and can be taken usually
Rated magnetizing current
Parameter
Description
Operating Instructions ACU
Stator resistance
Settings
Min. Max.
0 mΩ 65535 mΩ
0.001 Ω 100.000 Ω
30).
Configuration
30).
Configuration
216, the flow-forming current
Isq
716, regardless of the load on the
Leakage coefficient
Settings
Min. Max.
1.0 % 20.0 %
377
Fact. sett.
R
sN
10.000 Ω
216
Isq
sta-
Isd
Isd
378 in order
Fact. sett.
7.0 %
06/13