Auto-Tuning and Variable Frequency Drives - 4

A single-phase
induction motor
circuit model is
generated to help
the drive anticipate
and compensate for
changing loads on
the motor
Some of the measured values are
utilized to populate a single phase
induction motor circuit model as
shown in Figure 1.
All three phases should be the same.
For instance, by applying a DC
voltage to the stator and measuring
the created current with DC current
transformers, the drive calculates the
Line to Line Resistance which would
be RS
in the model.
The rest of the model can be
calculated using other techniques
and measurements and then
extrapolated into three phases. This
can help the drive better anticipate
and compensate for changing
loads on the motor and lead to
more efficient regulation of motor
operation.
.
WHEN THINGS GO
WRONG
Just like any operation of a VFD
and motor, there can be pitfalls
that can trip up the auto-tuning.
Manufacturers have a separate list
of faults that can occur during an
auto-tuning routine. The most typical
error happens before the auto-tune

Auto-Tuning and Variable Frequency Drives

Table of Contents for the Digital Edition of Auto-Tuning and Variable Frequency Drives

Auto-Tuning and Variable Frequency Drives - 1
Auto-Tuning and Variable Frequency Drives - 2
Auto-Tuning and Variable Frequency Drives - 3
Auto-Tuning and Variable Frequency Drives - 4
Auto-Tuning and Variable Frequency Drives - 5
Auto-Tuning and Variable Frequency Drives - 6
Auto-Tuning and Variable Frequency Drives - 7
Auto-Tuning and Variable Frequency Drives - 8
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