modelAIM_3ph
Extends from ComplexLib.Machines.Interfaces.PartialBasicElectricMachine3ph (Basic model for three-phase electric machines (no current phasor balance, no power calculation)).
Information
This approximation of a three-phase asynchronous induction machine using phasor
domain for the electrical subsystem is based on the well-known steady-state
equivalent circuit of such a machine.
The machine is an extension of the partial Interface package model
PartialBasicElectricMachine3ph of an electric three-phase machine.
The model has two electrical connectors of type ComplexPlug (which correspond
to six connectors of type ComplexPin) and one mechanical rotational flange.
The stator is assumed to be fixed in the housing.
The electrical submodel has three phases.
Each phase consists of a main inductance and two stray inductances as well
as a stator and a rotor resistance.
All inductances are assumed to be ideal (electrically linear, no
saturation).
The mechanical submodel contains a shaft which is fixed to the rotor.
Using this model, one can carry out steady-state or quasi-stationary
investigations of the electrical subsystem.
The mechanical subsystem may show transient behaviour which must be
sufficiently slow.
Attention!!!
To ensure that the phasor domain-based model works in a quasi-stationary
mode, the slip s may alter only very slowly in comparison
with both the nominal frequency f=ω/(2π) and the dominant
time constant of the electrical subsystem.
Fraunhofer IIS/EAS, Dresden
email: olaf.enge@eas.iis.fraunhofer.de
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.Inertia | J_Rotor (from PartialBasicMachine) | 1 | Rotor's moment of inertia |
| Integer | m (from PartialBasicElectricMachine3ph) | 3 | Number of phases |
| Real | n | 1 | Ratio of windings |
| SI.Resistance | Rs | 0.01 | Ohmic stator resistance per phase |
| SI.Resistance | Rr | 0.1 | Ohmic rotor resistance per phase |
| SI.Inductance | Ls | 1 | Stator inductance per phase |
| SI.Inductance | Lr | 1 | Rotor inductance per phase |
| Real | sigma | 0.001 | Stray ratio |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Mechanics.Rotational.Interfaces.Flange_a | shaft (from PartialBasicMachine) | Flange at shaft | |
| ComplexLib.MultiPhase.Interfaces.PosComplexPlug | plug_p (from PartialBasicElectricMachine3ph) | Positive complex plug | |
| ComplexLib.MultiPhase.Interfaces.NegComplexPlug | plug_n (from PartialBasicElectricMachine3ph) | Negative complex plug |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Mechanics.Rotational.Components.Inertia | inertiaRotor (from PartialBasicMachine) | ||
| Modelica.Mechanics.Rotational.Components.Fixed | fixedHousing (from PartialBasicMachine) | ||
| SI.Voltage[m] | v (from PartialBasicElectricMachine3ph) | Voltages between the two plugs | |
| SI.Voltage[m] | vRe (from PartialBasicElectricMachine3ph) | Active parts of voltage phasors | |
| SI.Voltage[m] | vIm (from PartialBasicElectricMachine3ph) | Reactive parts of voltage phasors | |
| SI.Current[m] | i (from PartialBasicElectricMachine3ph) | Currents flowing into positive plug | |
| SI.Current[m] | iRe (from PartialBasicElectricMachine3ph) | Active parts of current phasors | |
| SI.Current[m] | iIm (from PartialBasicElectricMachine3ph) | Reactive parts of current phasors | |
| SI.AngularFrequency | omegaMech | Angular velocity of rotor | |
| Real | s | Slip | |
| SI.Torque | Trq | Torque produced electrically | |
| SI.Power | P_mech | Mechanical power |