Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-07-28
1999-11-30
Enad, Elvin
Electrical generator or motor structure
Dynamoelectric
Rotary
310220, 310233, 310234, 310235, 310239, 310245, 310248, H01R 3906, H02K 1304
Patent
active
059948159
ABSTRACT:
An electric rotating machine has an armature coil comprising outer and inner coil trunks disposed in slots of an armature core as well as outer and inner coil arms disposed along an axial side surface of the armature core. The outer coil arms are arranged to operate as a commutator and in slidable contact with brushes. The diameters of the radially outermost parts of the outer coil arms and the brushes are larger than that of the radially outermost surface of the outer conductor. This arrangement assures a larger commutator-brush contact area that reduces current density as well as heat generation in the commutator-brush contact area. As the radially outwardly extending parts of the outer coil arms are exposed to the surrounding air, the outer coil trunk, the outer coil arm and the brushes as well as the radially outwardly extending part are cooled effectively during rotation of the armature core.
REFERENCES:
patent: 5508577 (1996-04-01), Shiga et al.
patent: 5650683 (1997-07-01), Shiga et al.
patent: 5698914 (1997-12-01), Shiga et al.
Niimi Masami
Takagi Yoshito
Denso Corporation
Enad Elvin
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