Cooling fan with reduced noise capability in an AC generator

Details Cooling fan with reduced noise capability in an AC generator Cooling fan with reduced noise capability in an AC generator

1992-10-15

1993-08-31

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

416223R, 298897, H02K 906, B63H 126

Patent

active

052412300

ABSTRACT:
A vehicular AC generator comprising a stator supported by a front bracket and a rear bracket; a rotor fixed to a rotating shaft supported by the front bracket and the rear bracket through bearings, provided with magnetic pole cores wherein a plurality of pairs of magnetic poles are formed in the circumferential direction, retaining an excitation coil; a pair of fans provided at a front end and a rear end of the magnetic pole cores; a plurality of inlet openings provided at end faces of the front bracket and the rear bracket; a plurality of outlet openings provided at peripheral portions of the front bracket and the rear bracket; and fans for cooling inside of the vehicular AC generator by circulating air therein by rotation of the rotor; wherein the fans each is fixed with a side plate at ends of blades thereof and at least in a front side fan of the both fans, a difference between an inner radius of the side plate and an inner radius of the inlet opening of the corresponding front bracket is larger than a width of the blade and the inner radius of the side plate is smaller than an outer radius of the inlet opening.

REFERENCES:
patent: 4418295 (1983-11-01), Shiga
patent: 4488070 (1984-12-01), Iwagi et al.
patent: 5021696 (1991-06-01), Nelson
patent: 5028826 (1991-07-01), Kitamura
patent: 5095235 (1992-03-01), Kitamura
patent: 5144175 (1992-09-01), Graggs

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