WOLFRAM SYSTEM MODELER
StrayLoadModel of stray load losses dependent on current and speed |
SystemModel["Modelica.Magnetic.QuasiStatic.FundamentalWave.Losses.StrayLoad"]
This information is part of the Modelica Standard Library maintained by the Modelica Association.
Stray load losses are modeled similar to standards EN 60034-2 and IEEE 512, i.e., they are dependent on square of current, but without scaling them to zero at no-load current.
For an estimation of dependency on varying angular velocity see: [Lang1984]
The stray load losses are modeled such way that they do not cause a voltage drop in the electric circuit. Instead, the dissipated losses are considered through an equivalent braking torque at the shaft.
The stray load loss torque is
tau = PRef/wRef * (i/IRef)^2 * (w/wRef)^power_w
where i
is the current of the machine and w
is the actual angular velocity.
The dependency of the stray load torque on the angular velocity is modeled by the exponent power_w
.
If it is desired to neglect stray load losses, set strayLoadParameters.PRef = 0
(this is the default).
m |
Value: 3 Type: Integer Description: Number of phases |
---|---|
useHeatPort |
Value: false Type: Boolean Description: = true, if heatPort is enabled |
strayLoadParameters |
Value: Type: StrayLoadParameters Description: Stray load loss parameters |
plug_p |
Type: PositivePlug Description: Positive quasi-static polyphase plug |
|
---|---|---|
plug_n |
Type: NegativePlug Description: Negative quasi-static polyphase plug |
|
flange |
Type: Flange_a Description: Shaft end |
|
support |
Type: Flange_a Description: Housing and support |
|
heatPort |
Type: HeatPort_a Description: Optional port to which dissipated losses are transported in form of heat |
v |
Type: ComplexVoltage[m] Description: Complex voltage |
|
---|---|---|
i |
Type: ComplexCurrent[m] Description: Complex current |
|
strayLoadParameters |
Type: StrayLoadParameters Description: Stray load loss parameters |
Modelica.Magnetic.QuasiStatic.FundamentalWave.BaseClasses Base model of machines |