StrayLoad
Model of stray load losses dependent on current and speed
Library
Modelica/Electrical/Machines/Losses/DCMachines
Description
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
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_strayLoadParameters | strayLoadParameters | Stray load loss parameters | FromModelica('Modelica.Electrical.Machines.Losses.StrayLoadParameters') | |
mo_useHeatPort | useHeatPort | =true, if heatPort is enabled | Number | 0 |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'v' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
p | implicit | Positive electrical pin | input | 1 |
n | implicit | Negative electrical pin | output | 1 |
flange | implicit | Shaft end | input | 2 |
support | implicit | Housing and support | input | 3 |
Port 5 | implicit | Optional port to which dissipated losses are transported in form of heat | input | mo_useHeatPort |