JP JP2014001731A
PROBLEM TO BE SOLVED: To improve a rotor, a stator, and a fan impeller driven by the rotor to cool an electric motor in an aspect advantageous in a manufacturing technology, especially for efficiency.SOLUTION: A fan impeller tip portion 29 protrudes from a base body 19, and/or a fan impeller blade 23 ends, in a bottom side thereof, away from an outer edge of the base body 19, thereby forming a diffuser area 30, and/or the maximum extension radius d of the fan impeller blade 23 is 1.5-0.6 times larger than the maximum extension radius of the base body 19 in a plan view.
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