Winding method for foil coil

A method for winding a foil to form a coil, comprising following process steps of:

• step S1:
• fixing an iron core (1) onto a winding device, and then preparing a winding die (2), wherein the winding die (2) is of a hollow structure, and the winding die (2) is sleeved around a core post of the iron core (1);
• step S2:
• measuring an actual size of each of the iron core (1), the winding die (2), a foil (3) and an insulating material arranged between every two layers of coil (4) eventually formed to prevent layer short circuit, and calculating a circumference of the foil (3) needed by each layer of coil (4) eventually formed;
• step S3:
• making one size mark (5) on the foil (3) at every regular interval;
• step S4:
• arranging the foil (3) on the winding device;
• step S5:
• fixing a start end of the foil (3), and arranging a reference point (6) on the winding die (2);
• step S6:
• starting to wind the foil (3), and when the reference point (6) being reached as a layer of the foil (3) being wound, measuring a distance between the foil at the reference point (6) and the mark (5) closest thereto, and calculating a circumference of the foil (3) actually wound up by the layer of foil (3);
• step S7:
• comparing the circumference of the foil (3) actually wound up calculated in step S6 with the circumference of the foil (3) calculated in step S2, in response to a determination that a preset standard requirement is met, proceeding with winding, and in response to a determination that the preset standard requirement is not met, performing an adjustment until the preset standard requirement is met;
• and
• step S8:
• after finishing winding, fixing a tail end of the coil (4) eventually formed on a preceding layer of the coil (4) to complete the coil (4).