Patent ID: 7188401

Claim:
A method of manufacturing a motor case, comprising: blanking a metal sheet so as to comprise: a first section; a second section and a third section, each of which is continued from the first section; a fourth section, continued from the second section and having a first edge; a fifth section, continued from the second section and having a second edge; a sixth section, continued from the third section and having a third edge; and a seventh section, continued from the third section and having a fourth edge; thinning at least a part of the fourth section including the first edge to form a first thinned part; thinning at least a part of the sixth section including the third edge to form a second thinned part; bending the second section and the third section so as to define a space adapted to accommodate a stator coil of a motor therebetween; bending the fourth section and the six section such that the first edge and the third edge are opposed to each other, and the first thinned part and the second thinned part face the space; and bending the fifth section and the seventh section such that the second edge and the fourth edge are opposed to each other, wherein the fourth section and the six section are kept flat after the bending.