type:progressive die
it made of stainless steel
Special technology
Making using the CNC,Wire E.D.M(slow wire c)

     EI lamination is one major design of OEM manufacturer shenzhen JR precision stamping,

     Losses

As discussed earlier, a transformer is a real component, and therefore has losses. These are divided into two primary types, but there are other "hidden" losses as well. All losses reduce efficiency, and affect frequency response. The low frequency limit is determined by the primary inductance, and this is proportional to the area (and consequent mass) of the transformer core. High frequency losses are caused by eddy currents in the core (see below), and by leakage inductance and winding capacitances.

None of these can be eliminated, but by careful selection of core material, winding style and operational limits, they can be reduced to the point where the transformer is capable of doing the job required of it.