Core losses can be separated into eddy current and hysteresis losses. The total core losses can thus be expressed as
P = PRef * (ratioHysteresis * (wRef / w) + 1 - ratioHysteresis) * (V / VRef)^2
where w
is the actual angular remagnetization
velocity and V
is the actual voltage. The term
ratioHysteresis
is the ratio of the hysteresis losses
with respect to the total core losses for the reference voltage and
frequency.
In the current implementation hysteresis losses are not
considered since complex numbers are not provided in
Modelica. Therefore, implicitly ratioHysteresis = 0
is
set. For the voltage and frequency range with respect to
Fig. 1, the dependency of total core losses on the parameter
ratioHysteresis
is depicted in Fig. 2. The
current implementation has thus the drawback over a model that
considers ratioHysteresis > 0
:
w
< wRef
)w
> wRef
)Fig. 1: Voltage versus angular velocity |
Fig. 2: Core losses versus angular velocity
with parameter ratioHysteresis |
In the current implementation it is assumed that
ratioHysteresis = 0
. This parameter cannot be changed
due to compatibility reasons.