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Description of the Software Modules and Parameters
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
495
4
Special case: Permanent field current
The field weakening mode "permanent field current" (
bit 0 = 1) makes it possible
to apply the field current preset value
= Field
). In this case the field weakening factor is without effects.
Therefore, the flux controller is deactivated at the ASM. The targeted flux is calculated
from the magnetization identification as follows:
with:
Flux
set
Flux set value in %
Lh(Imr)
Lh-characteristic (see
Imr
Magnetizing current. Imr = Isd set value is defined in this case.
Isd
set
Field current preset value
Flux
nom
Nominal value of the magnetic flux
Mode of operation of the field weakening factor
The field weakening factor at the ASM directly influences the current flux set value and at
the SM the field current set value as follows (also see diagram in
):
m
Asynchronous machine (
bit 0 = 0):
Flux set value in %
= Field weakening factor
Considering the extreme cases:
Field weakening factor = 0
means that a flux will
not
be
applied.
Field weakening factor = 1
means that a flux set value of 100%
will be applied.
For the range 0 < Field weakening factor < 1, the following applies:
the flux set value will be applied
proportionally.
m
Synchronous machine (
bit 0 = 0):
Isd set value
=
Field current preset value
* (1 - Field weakening factor
)
Considering the extreme cases:
Field weakening factor = 0
means that the value set for the field current
reference value will be applied.
Field weakening factor = 1
means that the value set for the field current
reference value will
not
be applied.
For the range 0 < Field weakening factor < 1, the following applies:
the value set for the field current reference
value will be applied proportionally.
Flux
set
100
Lh Imr
Isd
set
Flux
nom
=
Содержание b maXX BM2500
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