StrayLoad
Model of stray load losses dependent on current and speed
Library
Modelica/Magnetic/QuasiStatic/FundamentalWave/Losses
Description
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.
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_m | m | Number of phases | Scalar | |
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 | 'abs_v' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
plug_p | implicit | Positive quasi-static polyphase plug | input | 1 |
plug_n | implicit | Negative quasi-static polyphase plug | 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 |