Description of the Software Modules and Parameters
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
207
4
4.4.8
Autotuning of position / speed controller
The "system gain" that is determined by the complete inertia torque of the drive, the mo-
tor-torque constant Kt and the magnetic flux are combined at the rated point in the Ks fac-
tor
The actual value of the "gain" is calculated in the parameter ""Ks actual value"
The inverse of the "Ks actual value"
: (1/Ks), serves in the controller as a stan-
dardization constant between the acceleration value (speed controller output) and the
torque current set value. Therefore, ideally, the parameterization of the position/speed
controller is independent of the existing controlled system. The speed controller can be
parameterized with a symmetric optimum independent of the used motor and the existing
drive inertia torque.
The optimized values of the speed controller can not be used for all drives. For example,
a great load inertia could cause that the distortion in the torque current set value is ex-
ceeded by 10% of the motor nominal current, which was caused by the speed ripple (de-
pendent of the encoder type) and gained by a (1/Ks) which is too great. In this case the
encoder smoothing should be increased (to reduce the ripple) or a smoother setting of the
speed controller should be made. ProDrive offers a calculating tool for a smoother setting.
Automatic identification of controlled system
It is possible to carry out an automatic identification of the controlled system with the con-
troller. The values at the speed controller, the positioning controller Kv factor as well as
at the inertia torques and the Ks factor are determined. See
on page 714 for a detailed description.
4.4.8.1 Ks Determination
The value of the factor Ks at the measuring point, Ks factor
Ks calculation
The Ks factor
can be calculated as follows:
with
Ks factor
in (degree/s
2
)/A
Flux
nom
100% (according to definition of the Ks factor
)
Kt
Kt = Kt factor, in Nm/A
Kt factor
J
Torque of the drive in kg m
2
(Attention: Torque inertia parameters of the
controller are shown in kg cm
2
!)
Ks factor
180
o
-----------
Flux
nom
100
--------------------
Kt
J
------
=
Содержание b maXX BM2500
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