Magnetic saturation of energy storage inductor

How a Magnetic Inductor is made?

A. Magnetic Core Choices Inductors are made, by winding copper wire around magnetic cores. The cores usually contain an air gap purposefully cut into them to improve energy storage. Since the role of an inductor is to store energy, we will usually have one or more air gaps in the magnetic flux path of the core employed for an inductor.

How does a permanent magnet affect the saturation current limit?

The opposing flux introduced by a permanent magnet will extend the saturation flux limit of a given magnetic material. When full biasing of the core is achieved, the effective saturation current limit of a given inductor is doubled.

Why do inductors use permanent magnets?

These special kinds of inductors utilize permanent magnets (PMs) in order to introduce an opposing bias magnetic flux in the core material, effectively extending the saturation current limit. The different core and PM topologies used on PMIs, has been evolving from its early beginnings .

How does a core choice affect the magnetic properties of an inductor?

In summary, the core choice effects both magnetic and electrical properties of the inductor. In lecture 33 we will actually design an inductor making a variety of trade-offs. For now we will merely analyze the relationship K gand explore trends with the various core parameters that we may specify. b. Mutually Coupled Inductors Windings n 1and n

How to calculate magnetic induction intensity after adding air gap?

Combining with Eq. (20), the magnetic induction intensity can be obtained after adding the air gap. (21) B = u e N i L e = u c Z N i L e = u c 1 + L g L c u r N i L e When the magnetic material is diluted, the effective permeability or diluted permeability u e can be obtained, and then the diluted flux density B can be obtained.

Why do inductor cores have air gaps?

The cores usually contain an air gap purposefully cut into them to improve energy storage. Since the role of an inductor is to store energy, we will usually have one or more air gaps in the magnetic flux path of the core employed for an inductor. These air gaps will be precision machined as specified by the user. Air gaps help avoid exceeding B