When gap is put in flyback transformer - What does it do?

[eem2am]

flyback air gap

When a gap is put in a flyback transformer core….

What does it do?

…Does it make the magnetic field squeeze into the gap, and make the magnetic field very weak in the ferrite core material?

 

[pauloynski]

flyback core gap

Take a look on this file https://focus.ti.com/lit/ml/slup127/slup127.pdf

 

[FvM]

slup127

The linked chapter 5 of the legendary unitrode Magnetics Design for Switching Power Supplies seminar paper focusses
on a visual understanding of the gapped core's operation. For a fundamental answer on the raised question, it's
meaningful to my opinion, to reflect also the basic laws that rules a magnetic circuit. They are mainly discussed in the
seminar papers first section Introduction and basic magnetics.
https://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM401014

 

[yus]

Flyback with air gap

basically, the gap prevents the core from saturating..