Manufacturing method of magnetic element

A manufacturing method of a magnetic element, comprising:

• forming an insulation layer on an outer side of at least one section of a magnetic column of a magnetic core;
• forming a first waist groove on the insulation layer by adopting a drilling process, wherein the number of the first waist groove is one or more;
• forming a surface copper and a first hole copper respectively on a surface of the insulation layer and an inner surface of the first waist groove by adopting the metallization process;
• dividing the surface copper into a first surface copper close to the magnetic core and a second surface copper away from the magnetic core, and dividing the first hole copper into a first sidewall copper close to the magnetic core and a second sidewall copper away from the magnetic core, by adopting the mechanically dividing process at an end of the first waist groove along a depth direction of the first waist groove;
• pressing an insulation material into a gap between the first sidewall copper and the second sidewall copper, wherein the insulation material is higher than the first wiring layer to form a second insulation layer;
• drilling a hole on the second insulation layer, and forming a first conductor and a third surface copper respectively in the hole and on the second insulation layer through the metallization process, wherein the first conductor is located above the second surface copper;
• wherein
• the first surface copper and the first sidewall copper serve as a first horizontal portion and a first vertical portion respectively and together form a first wiring layer wound flat around the magnetic core, and an insulation layer between the first wiring layer and the magnetic core is a first insulation layer;
• the third surface copper, the second surface copper and the second sidewall copper serve as a second horizontal portion, a first transitional horizontal portion and a second vertical portion respectively, and form a second wiring layer flat wound around the magnetic core together with the first conductor.