Rotating Electric Machine and Manufacturing Method Thereof

A manufacturing method of a rotating electric machine, the rotating electrical machine comprises:

• a stator and a rotor that is rotatably provided through a rotary gap with respect to the stator, wherein the rotor includes a rotor core in which rotor plates punched from roll formed magnetic steel plate are laminated, and a spider that retains the rotor core, wherein the rotor core includes a plurality of keys arranged in their inner circumference contacting with the spider, wherein the spider includes a plurality of keyways arranged in its outer circumference contacting with the rotor, and wherein a plurality of keys of the rotor core and the plurality of keyways of the spider are formed in such a manner that they fit with each other;
• wherein a roll formed magnetic steel plate is punched so that one of the plurality of keys is arranged at 90 degrees to rolling direction of the steel plate;
• and
• the keys of the rotor core and the keyways of the spider are fitted in a combination that renders a weight imbalance of the rotor core due to lamination of the rotor plates and a weight imbalance of the spider cancel each other.