Package Modelica.Magnetic.QuasiStatic.FundamentalWave.LossesLoss models
Package Modelica.Magnetic.QuasiStatic.FundamentalWave.Losses
Standard package icon.
Extends from Modelica.Icons.Package (Icon for standard packages).
| Name | Description |
|---|---|
PermanentMagnetLosses | Model of permanent magnet losses dependent on current and speed |
StrayLoad | Model of stray load losses dependent on current and speed |
Model Modelica.Magnetic.QuasiStatic.FundamentalWave.Losses.StrayLoad
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).
Extends from Modelica.Electrical.QuasiStationary.MultiPhase.Interfaces.OnePort, 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).
| Type | Name | Default | Description |
|---|---|---|---|
Integer | m | 3 | Number of phases |
StrayLoadParameters | strayLoadParameters | Stray load loss parameters | |
Boolean | useHeatPort | false | =true, if heatPort is enabled |
| Type | Name | Description |
|---|---|---|
PositivePlug | plug_p | Positive quasi-static polyphase plug |
NegativePlug | plug_n | Negative quasi-static polyphase plug |
Flange_a | flange | Shaft end |
Flange_a | support | Housing and support |
HeatPort_a | heatPort | Optional port to which dissipated losses are transported in form of heat |
Model Modelica.Magnetic.QuasiStatic.FundamentalWave.Losses.PermanentMagnetLosses
Permanent magnet losses are modeled dependent on current and speed.
The permanent magnet 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 permanent magnet loss torque is
tau = PRef/wRef * (c + (1 - c) * (i/IRef)^power_I) * (w/wRef)^power_w
where i is the current of the machine and w is the actual angular velocity.
The parameter c designates the part of the permanent magnet losses that are present even at current = 0, i.e. independent of current.
The dependency of the permanent magnet loss torque on the stator current is modeled by the exponent power_I.
The dependency of the permanent magnet loss torque on the angular velocity is modeled by the exponent power_w.
Permanent magnet loss parameters
If it is desired to neglect permanent magnet losses, set strayLoadParameters.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).
| Type | Name | Default | Description |
|---|---|---|---|
Integer | m | 3 | Number of phases |
PermanentMagnetLossParameters | permanentMagnetLossParameters | Permanent magnet loss parameters | |
Boolean | useHeatPort | false | =true, if heatPort is enabled |
| Type | Name | Description |
|---|---|---|
Flange_a | flange | Shaft end |
Flange_a | support | Housing and support |
HeatPort_a | heatPort | Optional port to which dissipated losses are transported in form of heat |