MANUFACTURING METHOD OF COMMUTATOR, ARMATURE OF ROTATING ELECTRIC MACHINERY, AND BOARD MATERIAL FOR FORMING COMMUTATOR

摘要

PROBLEM TO BE SOLVED: To enhance the strength of a cable tab in a commutator and to surely carry out connection of winding wire to the cable tab. SOLUTION: The commutator 8 consists of an approximately cylindrical insulation body 12 and a plurality of segments (commutator pieces) 13 disposed on the outer periphery of the insulation body 12. A cable tab 16 is provided to extend from the end part of the segment 13 for cable-connecting a winding wire 17. At the root portion of the cable tab 16 a tapered part 21 is formed whose width in the circumferential direction becomes gradually narrower as it advances toward the tip end thereof while the thickness becomes gradually thinner.