Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
159
of 820
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171.4 Lq curve family
Nonlinear cross inductance depending on the currents Isd and Isq. The first index shows
the dependence of Id, the second of Iq.
171.5 Standardized current for inductance curve family
Maximum current for the set of characteristic curves. The curve families Z171.3– and
Z171.4– are standardized to this current.
171.10 Minimum Id Current
Minimum Id current determined by the field weakening controller. This is needed to re-
duce the flux at high speed and less torque request and to enable a higher torque at high
speed.
171.11 Id Current of MTPF characteristic
Maximum Id current which can be still supplied at a fixed flux. The maximum Id current is
taken from the MTPF characteristic. A higher Id current would not yield a higher torque at
constant flux.
171.12 Motor constant K
Factor
The current set values Id and Iq are calculated with this factor.
The motor factor can be calculated automatically via Bit 0 and 1 of parameter Control
word reluctance (
Z171.1–). The factor K is calculated via the nominal current and the
nominal Id current at bit 0 and from the mean values of Lq, Ld and the magnetic flux table
(
Z171.3–, Z171.4– and Z171.20–) at bit 1.
K
PM
4 Lq Ld–
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