Patent Number: 6,308,549

Title: Apparatus and method for forming spirally wound stator core or rotary electric machine

Abstract: An apparatus for forming a spirally wound stator core includes a pair of forming rollers having a wedge-shaped gap therebetween, a winding drum, a drum-drive motor, and a roller presser. A strip of magnetic material is inserted into the wedge-shaped gap to be pressed at a controlled pressure so that the strip is bent into a spiral with one side of the strip being radially inside. The controlled pressure is changed automatically according to a memorized relationship between the rotation speeds of the pair of forming rollers and suitable pressures applied to the strip.

Inventors: Tokizawa; Takashi (Nisshin, JP), Nagasaka; Katsumi (Obu, JP), Asano; Masahiro (Anjo, JP), Fujimoto; Toshihiko (Tokai, JP), Matsumoto; Katsumi (Okazaki, JP), Shiraishi; Katsuyoshi (Chiryu, JP), Maeda; Kazutaka (Toyota, JP), Nejigane; Satoru (Okazaki, JP)

Assignee: Denso Corporation

International Classification: H02K 15/02 (20060101); B21D 011/06 ()

Expiration Date: 10/30/2018