Low voltage aluminum commutators

Details Low voltage aluminum commutators Low voltage aluminum commutators

1976-02-09

1976-12-14

Yost, Frank T.

Metal working

Method of mechanical manufacture

Electrical device making

310235, H01R 4306

Patent

active

039966607

ABSTRACT:
In accordance with a preferred embodiment of this invention, a commutator for electrical machines having a polymeric spool and aluminum alloy bars uniformly spaced around its periphery is formed. This commutator is useful in low voltage applications wherein the applied or produced voltage may vary from 3 to 30 volts. A critical feature in forming this commutator is the combination of an electrolytic etch and an electrolytic oxide formation on the surface of the aluminum alloy bars. This combination of steps provides means for bonding the aluminum alloy bars to the polymeric spool and also lowers the electrical resistance of alumina. In addition, alloying elements, preferably iron, increase the conductivity of the alumina layer and directionally balance the electrical resistance across the aluminum-alumina junction.

REFERENCES:
patent: 2551030 (1951-05-01), Madden
patent: 3066387 (1962-12-01), Herbst
patent: 3519863 (1970-07-01), Ambler et al.

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