Discussion in 'General Electronics Chat' started by lokeycmos, Jun 19, 2010.
can someone please explain the difference between leakage inductance and magnetizing inductance? TY
Leakage inductance is the inductance that exists due to field leakage; it is magnetic field that goes through the air spacing between windings, the space between the wires and the core, etc.
This field does not couple primary and secondary windings.
Magnetizing inductance refers to inductance due to the field that does couple the windings.
I'd probably make a further small distinction in which I would call the inductance relating the magnetic flux linking of windings as mutual inductance rather than magnetizing inductance.
As Ghar points out, the flux which doesn't link primary and secondary windings on a transformer is regarded as leakage flux and is modeled by it's related leakage inductance.
In electrical devices utilizing magnetic properties such as transformers, generators and motors the greater part of the mutual (shared) flux is carried by an iron core. The difference observed between the self inductance and and mutual inductance of the device windings is usually what we denote as the winding leakage inductance. It is leakage inductance in part which gives rise to voltage loss in such devices.
Magnetizing inductance is probably that inductance value which relates the primary exciting (magnetizing) current [& by implication the effective magnetic core mutual flux] to the applied magnetizing voltage.