Low voltage aluminum commutators

Details Low voltage aluminum commutators Low voltage aluminum commutators

1974-12-23

1976-09-28

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 1304

Patent

active

039834310

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: 1641414 (1927-09-01), Critchfield
patent: 2316652 (1943-04-01), Moeller
patent: 3450914 (1969-06-01), Demerciere
patent: 3566460 (1971-03-01), Yamaguchi
patent: 3659130 (1972-04-01), Lilley
patent: 3668449 (1972-06-01), King
patent: 3777367 (1973-12-01), Kalagidis
patent: 3861027 (1975-01-01), Allen

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