Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
157
of 820
4
MTPF characteristic
The MTPF characteristic shows the maximum field current which can be impressed at a
specific flux reserve to reach the maximum torque. The x-axis indicates the flux in Vs and
the y-axis indicates the current in A. The MTPF characteristic is standardized in depen
-
dence of the nominal voltage and the nominal speed as it is assumed that the motors can
be operated without limiting the ld current. Thus, the flux reserve is divided in 15 equal
steps up to 0 by the nominal flux. The characteristic can be calculated automatically in the
controller by bit
12 of Z171.1–.The MTPF should be calculated again if the maximum cur-
rent (Z19.6–) or the maximum field current (Z146.12–) are changed.
Figure 79: State machine of field weakening at IPMSM
4.4.5.5 Parameter overview
Functional block: FbReluctance [171]
Number Name Type Min Max Default Value Unit Factor
Read only
Storage
DS Support
Cyclic Write
171.1 Control word reluctance UINT 0 0xFFFF 0 1:1
171.3 Ld curve family FLOAT 1e-5 1e9 1e-3 mH 1:1000 X
171.4 Lq curve family FLOAT 1e-5 1e9 1e-3 mH 1:1000 X
171.5 Norm current for inductance
chart familiy
FLOAT 0.01 1e9 10 A 1:1 X
171.10 Minimum Id Current FLOAT -1e9 0 0 A 1:1 X
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