Patent ID: 7654123
Filing Date: 2010-02-02
Classification: H01F,H02K,Y10T

Abstract:
1. A method of forming a slotted wound core having adjacent radial slots separated by an angle α, said method including the steps of: (a) Feeding a length of material through a punch arrangement and attaching an end of the material to a mandrel; (b) Calculating a length BC of the material between a first point B and a second point C, where point B is the point of intercept between a punch center of the punch arrangement and the material and the second point C is the point of contact between material wound on the mandrel and a roll radius measuring means; (c) Determining a next aperture punch point position A on the material, said position A being determined by the steps of: (d) Calculating a mandrel rotation index angle γ required to achieve a feed length AB; (e) Rotating the mandrel by index angle γ; (f) Punching an aperture in the material using the punch arrangement; and (g) Repeating steps (b) to (f) until a desired core radius is achieved.