Basic knowledge for Induction heating

As one of the induction heating equipment manufacturers from China , Baoding Chaochang Electromechanical Co.,Ltd has many successful experience in supply induction heating machine , including indution welding welder, induction hardening machine , induction quenching machine , induction annealing equipment and so on . Here we would like to introduce some basic knowledge for induction heating . 

1. Induction heating principle

 electromagnetic induction &Joule-lenz's law

2.  Skin effect ,proximity effect and ring-around of AC current:

  Current density on the conductor cross profile is not average.the

  maximum current density is on the conductor surface,and the  

  minimum is on the conductor axis,this kind of current gathering

  phenomenon is called skin effect.

  Proximity effect and ring-around effect is skin effect’s two form

  Law for current density on conductor surface

3. Current “Depth of penetration”:

From conductor surface to current density reduced to 1/e (0.368)   of the the surface current density in the radial distance.

1) When frequency is high (),

   the plamp on the depth penetration area is 86% of the total

   Power. Effective heating layer .

2) When frequency is low (),.

3) Usually at 2 point,the power is hardly 0.