Modelica.Electrical.Machines.Losses

Information

Package Content

Name	Description
FrictionParameters	Parameter record for friction losses
BrushParameters	Parameter record for brush losses
StrayLoadParameters	Parameter record for stray load losses
CoreParameters	Parameter record for core losses
PermanentMagnetLossParameters	Parameter record for permanent magnet losses
Friction	Model of angular velocity dependent friction losses
InductionMachines	Loss models for induction machines
DCMachines	Loss models for DC machines

Modelica.Electrical.Machines.Losses.FrictionParameters

Information

Parameter record for Friction losses.

Parameters

Name	Description
PRef	Reference friction losses at wRef [W]
wRef	Reference angular velocity that the PRef refer to [rad/s]
power_w	Exponent of friction torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.BrushParameters

Information

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

Parameters

Name	Description
V	Total voltage drop of brushes for currents > ILinear [V]
ILinear	Current indicating linear voltage region of brush voltage drop [A]

Modelica.Electrical.Machines.Losses.StrayLoadParameters

Information

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

Parameters

Name	Description
PRef	Reference stray load losses at IRef and wRef [W]
IRef	Reference RMS current that PRef refers to [A]
wRef	Reference angular velocity that PRef refers to [rad/s]
power_w	Exponent of stray load loss torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.CoreParameters

Information

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

Parameters

Name	Description
m	Number of phases (1 for DC, 3 for induction machines)
PRef	Reference core losses at reference inner voltage VRef [W]
VRef	Reference inner RMS voltage that reference core losses PRef refer to [V]
wRef	Reference angular velocity that reference core losses PRef refer to [rad/s]

Modelica.Electrical.Machines.Losses.PermanentMagnetLossParameters

Information

Parameter record for permanent magnet losses.

Parameters

Name	Description
PRef	Reference permanent magnet losses at IRef and wRef [W]
c	Part of permanent magnet losses at current = 0, i.e. independent of current
IRef	Reference stator RMS current that PRef refers to [A]
power_I	Exponent of permanent magnet loss torque w.r.t. stator current
wRef	Reference angular velocity that PRef refers to [rad/s]
power_w	Exponent of permanent magnet loss torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.Friction

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

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).

Parameters

Name	Description
frictionParameters	Friction loss parameters
useHeatPort	=true, if heatPort is enabled

Connectors

Name	Description
flange	Shaft end
support	Housing and support
heatPort	Optional port to which dissipated losses are transported in form of heat