StrayLoad
Model of stray load losses dependent on current and speed
Library
Modelica/Electrical/Machines/Losses/InductionMachines
Description
Stray load losses are modeled similar to standards EN 60034-2 and IEEE 112, 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:
W. Lang, Über die Bemessung verlustarmer Asynchronmotoren mit Käfigläufer für Pulsumrichterspeisung,
Doctoral Thesis, Technical University of Vienna, 1984.
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_v | v | v | Structure | |
mo_v/fixed | fixed | Cell of vectors | true | |
mo_v/start | start | Cell of vectors | ||
mo_i | i | i | Structure | |
mo_i/fixed | fixed | Cell of vectors | true | |
mo_i/start | start | Cell of vectors | ||
mo_phi | phi | phi | Structure | |
mo_phi/fixed | fixed | Cell of scalars | true | |
mo_phi/start | start | Cell of scalars | ||
mo_tau | tau | tau | Structure | |
mo_tau/fixed | fixed | Cell of scalars | true | |
mo_tau/start | start | Cell of scalars | ||
mo_w | w | w | Structure | |
mo_w/fixed | fixed | Cell of scalars | true | |
mo_w/start | start | Cell of scalars | ||
mo_lossPower | lossPower | lossPower | Structure | |
mo_lossPower/fixed | fixed | Cell of scalars | true | |
mo_lossPower/start | start | Cell of scalars | ||
mo_iRMS | iRMS | iRMS | Structure | |
mo_iRMS/fixed | fixed | Cell of scalars | true | |
mo_iRMS/start | start | Cell of scalars |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
plug_p | implicit | Positive polyphase electrical plug with m pins | input | 1 |
plug_n | implicit | Negative polyphase electrical plug with m pins | 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 |