Functions Of Field-Orientated Control; Current Controller - BONFIGLIOLI Agile Operating Instructions Manual

Parameter descriptions
7.9.5

Functions of field-orientated control

The field-orientated control systems are based on a cascade control and the calculation of a complex
machine model. In the course of the guided commissioning, a map of the connected machine is pro-
duced by the parameter identification and transferred to various parameters. Some of these parame-
ters are visible and can be optimized for various operating points.

7.9.5.1 Current controller

700 Amplification
701 Integral Time
The current controller with the parameters
field-orientated control (setting 410 or 610 of parameter
In the control according to V/f-characteristic (setting 110 of parameter
controller is only applicable for the function Flying Start (parameter
645).
Start
The inner control loop of the field-orientated control comprises two current controllers. The field-
orientated control thus impresses the motor current into the machine via two components to be con-
trolled.
This is done by:
− controlling the flux-forming current value I
− controlling the torque-forming current value I
By separate regulation of these two parameters, a decoupling of the system equivalent to an external-
ly excited direct current machine is achieved.
The set-up of the two current controllers is identical and enables joint setting of am-plification as well
as the integral time for both controllers. For this, the parameters
701 are available. The proportional and integration and component of the current con-
Integral Time
trollers can be switched off by setting the parameters to zero.
Parameters
No. Description
700 Amplification
701 Integral Time
The guided commissioning has selected the parameters of the current controller in such a way that
they can be used without having to be changed in most applications.
If, in exceptional cases, an optimization of the behavior of the current controllers is to be done, the
reference value jump during the flux-formation phase can be used for this. The reference value of the
flux-forming current components leaps to the figure
parameterization and then changes controlled to the magnetizing current after the expiry of the
780. The operating point necessary for the adjustment demands the setting of
Flux-Formation Time
parameter
Minimum Frequency
of the jump reply, which is defined by the ratio of the currents mentioned, should be done in the mo-
tor supply line by means of a measuring current transformer of a sufficient bandwidth.
The internally calculated actual value for the flux-forming current component cannot
be output via the analog output for this measurement as the time resolution of the
measurement is not sufficient.
To set the parameters of the PI controller, the
value overshoots distinctly during the control process. Now, the amplification is reduced to about fifty
percent again and then the
during the control process.
Control functions
Amplification
sd
sq
Min.
0.00
0.00 ms
Current during Flux-Formation
418, as the drive is accelerated after magnetizing. The measurement
Amplification
701 is synchronized until actual value overshoots slightly
Integral Time
229
700 and
Integral Time
30).
Configuration
Configuration
Operation Mode Flying
Amplification
Setting
Max. Fact. sett.
8.00 0.13
10.00 ms 10.00 ms
700 is increased first until the actual
06/2013 Operating Instructions
701 is applicable for
30) the current
700 and Parameter
781 with suitable
Max.
Agile