Feature Configuration
ANCA Motion
DS619-0-00-0019 - Rev 0
133
10
And finally, the type of voltage control must be selected by setting IDN P-0-041 / 32809. A value of 0
corresponds to separate (quadrature-direct) current controllers suitable for PMSM Motor control, and a value of 1
in the IDN corresponds to a single current controller suitable for Induction Motor control.
A summary of the above settings for the two different types of supported motor is as follows;
User/external entity must set the...
IDN
Motor Type
PMSM
IM V/F
Primary mode of current control
P-0-503 / 33271
10
15
Primary mode of torque control
P-0-222 / 32990
10
15
Technique of motor commutation
P-0-506 / 33274
10
15
Technique of voltage control
P-0-041 / 32809
0
1
If Motor Type =PMSM
When the motor type has been set for PMSM, there are further options that may be chosen. PMSM torque
control usually converts torque commands directly to
q
-axis current command for the current control using
,
as previously described. The exception to this is for higher speeds where the user may wish to alter this simple
relationship to account for power limits by using a Field Weakening technique.
Field Weakening
In such cases, the AMD2000 incorporates a Field Weakening technique to command higher velocity from the
PMSM at digressively lower torque in order to stay within the motor’s maximum power output limits. This
technique reduces the allowable limit on q-axis current commands, while increasing the d-axis current command.
Below is an example of a typical field weakening curve that might be set by the user. Here, the non-field
weakening current limit is set to 50A (P-0-0232 / 33000). At 5000RPM field weakening begins, and the user
needs to define the Field Weakening Current Command profile (P-0-0929 / 33697, P-0-0930 / 33698, P-0-0931 /
33699). The drive will then calculate the Torque Producing Current Limit internally so as not to violate the overall
current limit (P-0-0232 / 33000).
Figure 10-22 Example of Field Weakening
Number of break points (up to 12):
P-0-0929 = 11
Velocity break points [RPM]:
P-0-0930 = [5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000]
Field Weakening (d-axis) Current Command break points [mA]:
P-0-0931 = [0, 7125, 12068, 16159, 20000, 23125, 26250, 29375, 32500, 35625, 38750]