Controllers
Parameter manual b maXX BM5800
Document No.: 5.16029.03 Baumüller Nürnberg GmbH
506
of 814
3.7
3.7.7.6 Adaption to the Saturation
Asynchronous motors
During the operation of the asynchronous motors with encoder the current model is used.
This motor generates the flux actual value from the field current with the rotor time con
-
stant and the main inductance (Lh). To consider the non-linearity of the main inductance
in the field weakening a Lh-characteristic is used.
Figure 134: Flux actual value with encoder, current model with Lh-characteristic
with
Flux act Actual value of the magnetic Flux in % Z146.14–
Tr Rotor time constant, in s
Lh act Magnetizing inductance, actual value, in H
Flux nom Magnetic flux nominal value in Vs
Id act Field current actual value in A
Im act Magnetizing current actual value in A
The Lh-characteristic can be entered manually. It can be detected in the idle state of the
motor (see chapter
ZLh-characteristic– on page 123) as well.
The adaption of the flux actual value applies to the following:
m Standardization constant (1/Ks
act
) of the speed controller output and the torque cur-
rent set value
m Torque monitoring ("Max. torque actual value" Z138.20–, "Torque display"
Z138.21– and "Torque limit symmetric " Z138.22–)
m Slip specification (ASM with encoder, refer to ZTemperature adaption slip frequen-
cy– on page 508)
m EMF feed forward
Synchronous motors
The synchronous motors operate generally in the linear range of the torque current char-
acteristic until standstill current lo (or in the linear range of the Lq inductance i.e. Lq = con-
stant).
5000_0348_rev02_int.cdr
100
Tr
N
D
N
D
Id act
Lh act
Im act
Flux nom
[Vs]
Flux act
[%]
Lh char.
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