Primary Winding

Linear nonideal transformer winding


Passive Devices / Transformers / Fundamental Components


The Primary Winding block models linear nonideal winding of a transformer with linear winding leakage and linear core magnetization effects. Although magnetization effects occur in the magnetic core, it is common practice to place mathematically equivalent electrical components on the electrical winding and parameterize them using electrical parameters. The figure shows the equivalent circuit diagram for the primary winding.

  • Rl is the leakage resistance.

  • Ll is the leakage inductance.

  • Rm is the magnetization resistance.

  • Lm is the magnetization inductance.


Main Tab

Number of winding turns

Number of wire turns on the transformer winding. The default value is 10.

Leakage resistance

Power loss in the winding. The default value is 1e-3 Ohm.

Leakage inductance

Magnetic flux loss in the winding. The default value is 1e-3 H.

Core-loss resistance

Magnetic losses in the transformer core. The default value is 1e6 Ohm.

Magnetization inductance

Magnetic effects in the transformer core when operating in its linear region. The default value is 1e6 H.

Variables Tab

Use the Variables tab to set the priority and initial target values for the block variables before simulation. For more information, see Set Priority and Initial Target for Block Variables (Simscape) .

Unlike block parameters, variables do not have conditional visibility. The Variables tab lists all the existing block variables. If a variable is not used in the set of equations corresponding to the selected block configuration, the values specified for this variable are ignored.


The block has the following ports:


Positive electrical conserving port


Negative electrical conserving port


North magnetic conserving port


South magnetic conserving port

Introduced in R2013b

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