Introduction of air gap, etc

Reference link

https://mp.weixin.qq.com/s/gEBdThoI4OS2otzSiKHv_w

Air gap

1. Definition

The air gap of the magnetic core refers to that part of the magnetic furnace is composed of air , It is called air gap , Air gap for short

1. effect

2.1） Reduce permeability

2.2） Increase the saturation current Isat

2.3） Increase the ability to store energy

2.4） Reduce remanence Br

2.5） Design of air gap size ： Need to meet the current size ; The volume should not be too large ;

The magnetic core of the transformer is to transmit magnetic energy ;

Inductance stores magnetic energy

Magnetic field energy density ：E=0.5*B*H;

The magnetic core has high permeability ; Low air gap permeability , The magnetic field has great energy

Magnetic field energy is mainly stored in the air gap , The magnetic core is just a magnetic flux path , So inductance needs air gap ;

The higher the permeability of the magnetic core , The air gap reduces the effective permeability more obviously ;