MPH-02, MPB-02, MPD-02
Drive Control
6-17
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
The flux loop works as a P-loop with command value feedforward. It
compares the actual value from the rotor flux model to the command
value from flux feedforward and voltage loop and by the corresponding
input of the flux-generating current component I
d-cmd
provides for rapid
rotor flux generation. This is of importance for applications with dynamic
speed response (field weakening range). The gain can be set in
parameter
P-0-0528, Flux control loop proportional gain
.
Note:
For Rexroth motors the corresponding value is stored in the
"DriveBase" data base.
The stall current limit only takes effect in the power limit range of the field
weakening range (3). The maximum allowed torque-generating current is
calculated by means of the active rotor flux and the motor data. This
absolute limit value can be relatively changed via the setting in parameter
P-0-0529, Scaling of stall current limit
(in percent).
Note:
When operating a motor without field weakening (generally in
the case of linear asynchronous motors) it is only the effective
magnetizing current that is accepted as command value for
the field-generating current component.
Notes on Commissioning
Note:
The current loop was preset for all Rexroth motors and
normally does not have to be adjusted.
For notes on how to commission the current loop for third-
party motors see "Third-Party Motors" in chapter "Motor,
Mechanical Axis System, Measuring Systems"!
The current loop for the torque- or force-generating current (I
q
) designed
as a PI loop can be set via the following parameters:
•
S-0-0106, Current loop proportional gain 1
•
S-0-0107, Current loop integral action time 1
The respective parameter settings depend on the properties of the motor
winding (L and R) and on the sampling time of the current loop.
Availability of the parameter settings for the current loop:
•
For Rexroth motors with motor data memory they are stored in this
memory.
•
For Rexroth motors without motor data memory they can be taken
from a motor data base during commissioning via "DriveTop".
•
For third-party motors they have to be calculated by means of the data
sheet (see "Third-Party Motors" in chapter "Motor, Mechanical Axis
System, Measuring Systems").
See also "Commissioning the Motor" in chapter "Commissioning"
The voltage loop designed as a PI loop can be set via the following
parameters:
•
P-0-0533, Voltage loop proportional gain
•
P-0-0534, Voltage loop integral action time
Flux Loop
Stall Current Limit
Current Loop
(Torque-Generating Current)
Voltage Loop
(Flux Loop)
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of
CMA/Flodyne/Hydradyne
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