Ideal Transformer
Purpose
Ideally coupled windings with or without magnetizing inductance
Library
Electrical / Transformers
Description
This component represents a transformer with two or more ideally coupled
windings. At all windings , the voltage
across the winding divided by the
corresponding number of turns
is the same:
If the transformer does not have a finite magnetizing inductance (i.e. the inductance
value is set to inf), the currents of all windings multiplied with the
corresponding number of turns add up to zero:
If the transformer does have a finite magnetizing inductance, the currents of all
windings multiplied with the corresponding number of turns add up to the
magnetizing current multiplied with the number of turns in the first winding:
In the transformer symbol, the first primary side winding is marked with a little circle. The orientation of the other windings is indicated by a dot. Currents entering a terminal marked with the circle or a dot are considered positive.
Use the Polarity parameter to change the orientation of a specific winding. This
is equivalent to making the corresponding number of turns negative.
Parameters
- Number of windings
- A two-element vector
containing the number of windings on the primary side
and on the secondary side
. The default is [1 1], which represents a two-winding transformer with opposite windings.
- Number of turns
- A row vector specifying the number of turns for each winding. The vector length must match the total number of primary and secondary side windings. First, all primary side windings are specified, followed by the specifications for all secondary side windings.
- Polarity
- A string consisting of one + or - per winding specifying the winding polarity. A single + or - is applied to all windings.
- Magnetizing inductance
- A non-zero scalar specifying the magnetizing inductance referred to the first winding, in henries (H).
- Initial magnetizing current
- A scalar specifying the initial current through the magnetizing inductance at simulation start, in Amperes (A). Must be zero if the magnetizing inductance is infinite inf.