Package Modelica.​Electrical.​Machines.​Losses
Loss models for electric machines

Information

This package contains loss models and their parameter records used for machine models.

Extends from Modelica.​Icons.​Package (Icon for standard packages).

Package Contents

NameDescription
BrushParametersParameter record for brush losses
CoreParametersParameter record for core losses
DCMachinesLoss models for DC machines
FrictionModel of angular velocity dependent friction losses
FrictionParametersParameter record for friction losses
InductionMachinesLoss models for induction machines
PermanentMagnetLossParametersParameter record for permanent magnet losses
StrayLoadParametersParameter record for stray load losses

Record Modelica.​Electrical.​Machines.​Losses.​FrictionParameters
Parameter record for friction losses

Information

Parameter record for Friction losses.

Extends from Modelica.​Icons.​Record (Icon for records).

Fields

TypeNameDescription
parameter PowerPRefReference friction losses at wRef
parameter AngularVelocitywRefReference angular velocity that the PRef refer to
parameter Realpower_wExponent of friction torque w.r.t. angular velocity
parameter TorquetauRefReference friction torque at reference angular velocity
parameter ReallinearLinear angular velocity range with respect to reference angular velocity
parameter AngularVelocitywLinearLinear angular velocity range
parameter TorquetauLinearTorque corresponding with linear angular velocity range

Record Modelica.​Electrical.​Machines.​Losses.​BrushParameters
Parameter record for brush losses

Information

Parameter record for three-phase Brush and DC Brush losses.

Extends from Modelica.​Icons.​Record (Icon for records).

Fields

TypeNameDescription
parameter VoltageVTotal voltage drop of brushes for currents > ILinear
parameter CurrentILinearCurrent indicating linear voltage region of brush voltage drop

Record Modelica.​Electrical.​Machines.​Losses.​StrayLoadParameters
Parameter record for stray load losses

Information

Parameter record for three-phase and DC stray load losses.

Extends from Modelica.​Icons.​Record (Icon for records).

Fields

TypeNameDescription
parameter PowerPRefReference stray load losses at IRef and wRef
parameter CurrentIRefReference RMS current that PRef refers to
parameter AngularVelocitywRefReference angular velocity that PRef refers to
parameter Realpower_wExponent of stray load loss torque w.r.t. angular velocity
parameter TorquetauRefReference stray load torque at reference angular velocity and reference current

Record Modelica.​Electrical.​Machines.​Losses.​CoreParameters
Parameter record for core losses

Information

Parameter record for core losses of induction machines and core losses of DC machines.

Extends from Modelica.​Icons.​Record (Icon for records).

Fields

TypeNameDescription
parameter IntegermNumber of phases (1 for DC, 3 for induction machines)
parameter PowerPRefReference core losses at reference inner voltage VRef
parameter VoltageVRefReference inner RMS voltage that reference core losses PRef refer to
parameter AngularVelocitywRefReference angular velocity that reference core losses PRef refer to
parameter RealratioHysteresisRatio of hysteresis losses with respect to the total core losses at VRef and fRef
parameter ConductanceGcRefReference conductance at reference frequency and voltage
parameter AngularVelocitywMin 

Record Modelica.​Electrical.​Machines.​Losses.​PermanentMagnetLossParameters
Parameter record for permanent magnet losses

Information

Parameter record for permanent magnet losses.

Extends from Modelica.​Icons.​Record (Icon for records).

Fields

TypeNameDescription
parameter PowerPRefReference permanent magnet losses at IRef and wRef
parameter RealcPart of permanent magnet losses at current = 0, i.e. independent of current
parameter CurrentIRefReference stator RMS current that PRef refers to
parameter Realpower_IExponent of permanent magnet loss torque w.r.t. stator current
parameter AngularVelocitywRefReference angular velocity that PRef refers to
parameter Realpower_wExponent of permanent magnet loss torque w.r.t. angular velocity
parameter TorquetauRefReference permanent magnet loss torque at reference angular velocity and reference current

Model Modelica.​Electrical.​Machines.​Losses.​Friction
Model of angular velocity dependent friction losses

Information

The friction losses are considered by the equations

   tau / tauRef = (+w / wRef) ^ power_w    for w > +wLinear
 - tau / tauRef = (-w / wRef) ^ power_w    for w < -wLinear

with

  tauRef * wRef = PRef

being the friction torque at the reference angular velocity wRef. The exponent power_w is approximately 1.5 for axial ventilation and approximately 2.0 for radial ventilation.

For stability reasons the friction torque tau is approximated by a linear curve

  tau / tauLinear = w / wLinear

with

  tauLinear = tauRef*(wLinear/wRef) ^ power_w

in the range -wLinear ≤ w ≤ wLinear with wLinear = 0.001 * wRef. The relationship of torque and angular velocity is depicted in Fig. 1

frictiontorque.png
Fig. 1: Friction loss torque versus angular velocity for power_w = 2

See also

FrictionParameters

If it is desired to neglect friction losses, set frictionParameters.PRef = 0 (this is the default).

Extends from Modelica.​Electrical.​Machines.​Interfaces.​FlangeSupport (Shaft and support) and Modelica.​Thermal.​HeatTransfer.​Interfaces.​PartialElementaryConditionalHeatPortWithoutT (Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models).

Parameters

TypeNameDefaultDescription
FrictionParametersfrictionParameters Friction loss parameters
BooleanuseHeatPortfalse=true, if heatPort is enabled

Connectors

TypeNameDescription
Flange_aflangeShaft end
Flange_asupportHousing and support
HeatPort_aheatPortOptional port to which dissipated losses are transported in form of heat

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