modelStrayLoad
Extends from Modelica.Electrical.Analog.Interfaces.OnePort (Component with two electrical pins p and n and current i from p to n), Machines.Interfaces.FlangeSupport (Shaft and support), 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).
Information
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.
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.
See also
If it is desired to neglect stray load losses, set strayLoadParameters.PRef = 0 (this is the default).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Machines.Losses.StrayLoadParameters | strayLoadParameters | Stray load loss parameters | |
| Boolean | useHeatPort (from PartialElementaryConditionalHeatPortWithoutT) | false | = true, if heatPort is enabled |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| PositivePin | p (from TwoPin) | Positive electrical pin | |
| NegativePin | n (from TwoPin) | Negative electrical pin | |
| Modelica.Mechanics.Rotational.Interfaces.Flange_a | flange (from FlangeSupport) | Shaft end | |
| Modelica.Mechanics.Rotational.Interfaces.Flange_a | support (from FlangeSupport) | Housing and support | |
| HeatTransfer.Interfaces.HeatPort_a | heatPort (from PartialElementaryConditionalHeatPortWithoutT) | Optional port to which dissipated losses are transported in form of heat |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Voltage | v (from TwoPin) | Voltage drop of the two pins (= p.v - n.v) | |
| SI.Current | i (from OnePort) | Current flowing from pin p to pin n | |
| SI.Angle | phi (from FlangeSupport) | Angle between shaft and support | |
| SI.Torque | tau (from FlangeSupport) | Torque | |
| SI.AngularVelocity | w (from FlangeSupport) | Relative angular velocity of flange and support | |
| SI.Power | lossPower (from PartialElementaryConditionalHeatPortWithoutT) | Loss power leaving component via heatPort (> 0, if heat is flowing out of component) |