CoreModel of core losses 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
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 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 reference inner voltage and reference angular velocity.
For the voltage and angular velocity range with respect to Fig. 1,
the dependency of total core losses on the parameter ratioHysteresis
is depicted in Fig. 2.
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.
useHeatPort 
Value: false Type: Boolean Description: =true, if heatPort is enabled 

coreParameters 
Value: Type: CoreParameters Description: Armature core losses 
w 
Type: AngularVelocity (rad/s) Description: Remagnetization angular velocity 

p 
Type: PositivePin Description: Positive electrical pin 


n 
Type: NegativePin Description: Negative electrical pin 

heatPort 
Type: HeatPort_a Description: Optional port to which dissipated losses are transported in form of heat 
coreParameters 
Type: CoreParameters Description: Armature core losses 

Modelica.Electrical.Machines.Interfaces Partial model for DC machine 