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US 6,617,718 B2Granted
Automotive alternator
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAtsushi Oohashi, Yoshihito Asao
Life of this patent
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Abstract
Centrifugal fans are fixed to axial end surfaces of first and second pole cores such that 0.2<t/h<0.7, where t is an amount of axial protrusion of the centrifugal fans relative to apex portions of front-end and rear-end coil end groups of a stator winding and h is an axial height of the centrifugal fans.
Claims7
An automotive alternator comprising:
- a shaft rotatably supported by a case;
- a rotor fixed to said shaft;
- a stator provided with:
- a cylindrical stator core supported by said case so as to envelop said rotor, a plurality of slots extending axially being formed in said stator core so as to line up circumferentially;
- and
- a stator winding installed in said stator core;
- a rectifier supported by said case so as to face an axial end surface of said rotor;
- and
- at least one cooling fan fixed to at least one axial end surface of said rotor,
- wherein said cooling fan is constructed such that a ratio (t/h) between an amount of axial protrusion t of said cooling fan relative to an apex portion of a coil end group of said stator winding and an axial height h of said cooling fan satisfies an expression 0.2<t/h<0.7.
7 more elements
Dependencies are inferred from the claim text.