Further Motor Parameters; Stator Resistance; Leakage Coefficient - BONFIGLIOLI ACTIVE CUBE 201 Operating Instructions Manual

11.2

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.
11.2.1

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
winding resistance in delta connection.
By default, the equivalent stator resistance of a standard motor was entered to match the reference
output of the frequency inverter.
Parameter
No. Description
377 Stator Resistance
1190 Stator Resistance
1)
In settings 1xx, 2xx, 4xx of Parameter
2)
In settings 5xx and 6xx of Parameter
Stator resistance asynchronous motor:
The stator resistance of an asynchronous motor can be optimized while the machine is in no-load
operation. At the stationary operating point, the torque-forming current
estimated
Active Current
resistance, the adjustment should be done at a winding temperature which is also reached during
normal operation.
A correct measurement will optimize the control functions.
Stator resistance synchronous motor:
The stator resistance value of a synchronous machine is entered during commissioning. The stator
resistance is needed for the current controller settings and should be available and entered as
exactly as possible for this reason. The
motor phases and can typically be applied directly from the motor data sheet.
11.2.2

Leakage coefficient

The leakage coefficient of the machine defines the ratio of the leakage inductance to the main
inductance. The torque and flux-forming current components are thus coupled via the leakage
coefficient. Optimization of the leakage coefficient within the field-oriented control systems demands
an acceleration to various operating points of the drive. The flux-forming current
largely independent of the load torque (unlike the torque-forming current
current component is inversely proportional to the leakage coefficient. If the leakage coefficient is
increased, the torque-forming current increases and the flux-forming component drops. The
adjustment should result in a relatively constant actual current
716, regardless of the load on the drive.
Magnetising Current
The sensorless control system uses the parameter
synchronization to one drive.
Parameter
No. Description
378 Leakage coefficient
122
Stator Resistance
Min.
1)
0 m
2)
0.001 
Configuration
Configuration
214 should be zero. Due to the temperature-dependent of the stator
Stator Resistance
Min.
1.0 %
Operating Instructions ACU
377 and is 3 times smaller than the
Setting
Max.
65535 m
100.000 
30
.
30
.
1190 is referred to the value between two
215 matching the set
Isd
378 in order to optimize the
Leakage Coeff.
Setting
Max.
20.0 %
Factory setting
R
sN
10.000 
216 and/or the
Isq
215 should be
Isd
216). The flux-forming
Isq
Rated
Factory setting
7.0 %
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