Manufacture method of magnetic coil in wireless charging system

1. A method for manufacturing a magnetic coil in a wireless charging system, wherein the coil comprises a wire with a rectangular cross section, the method comprising:

feeding a wire into a routing device which includes three winding wheels;

routing the wire into a magnetic coil by changing positions of the winding wheels;

assembling the magnetic coil by pressing and attaching the magnetic coil to a coil holder;

obtaining a position of a first point P (X P , Y P , Z P ) on the wire, a radius of curvature of the first point R p , and a position of a second point c 1 (X c1 , Y c1 , Z c1 );

calculating a position of a third point a 1 (X a1 , Y a1 , Z a1 ), and a center of curvature of the first point O (X O , Y O , Z O );

calculating a position of a fourth point b 1 (X b1 , Y b1 , Z b1 ); and

calculating positions of centers of the winding wheels A (X A , Y A , Z A ), B (X B , Y B , Z B ) and C (X C , Y C , Z C ), wherein the winding wheels contact with the wire at points a 1 (X a1 , Y a1 , Z a1 ), b 1 (X b1 , Y b1 , Z b1 ) and c 1 (X c1 , Y c1 , Z c1 ), and a first line that passes through points P and B is perpendicular to a second line that passes through points a 1 and c 1 .

2. The method of claim 1 , wherein the surface of the wire has an insulating layer.

3. The method of claim 1 , wherein the coil has multiple turns of the wire, and two adjacent turns are spaced with a distance.

4. The method of claim 1 , wherein the distance between adjacent turns ranges from 0.1 mm to 1 mm.

5. The method of claim 1 , further comprising forming a curvature of a point on the wire by setting positions of the winding wheels.