This approximation of a three-phase synchronous machine using phasor
domain for the electrical subsystem is based on the behaviour of the
steady-state equivalent circuit of such a machine.
This behaviour is defined by appropriate equations.
The machine is an extension of the partial Interface package model
`PartialBasicElectricMachine3phPwr_wBalance` of an electric
three-phase machine including both the current balances and the power
calculation.

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 if the default value of the
'number of phases'-parameter `m` is used.
In order to model a system with different number of phases, the
'number of phases'-parameter has to be changed in all
appearing multi-phase components and connectors.

Each phase consists of a constant inductance (stator's self-inductance)
and an electromagnetic force (emf) realising the effect of the rotor current
on the stator via the mutual inductance.
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 torque angle `δ` (also called rotor displacement angle)
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

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