Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1984-04-18
1985-05-07
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310240, H02K 1300
Patent
active
045160473
ABSTRACT:
A reversible electric motor has two pairs of brushes, a separate pair for each direction of rotation. The mean diametrical positions of the two pairs are fixed with respect to the motor's stator and angularly offset. The brushes of the one or the other pair, exclusively, are selected for application against the commutator as a function of the selected direction of rotation. Preferably a rotatable cam is arranged to lift the brushes of the non-selected pair from the commutator and insulating segments are inserted between the lifted brushes and the commutator. To simplify wiring, adjacent brushes, one from each pair, may be electrically connected together. Both pairs of brushes may advantageously be lifted from the commutator during motor reversal to eliminate risk of short-circuiting the commutator and also to interrupt supply of power thereto.
REFERENCES:
patent: 297867 (1884-04-01), Sperry
patent: 432561 (1890-07-01), Reckenzaun
patent: 530114 (1894-12-01), Moderegger
patent: 2472018 (1949-05-01), Johnson
patent: 2475276 (1949-07-01), Briggs
patent: 2764705 (1956-09-01), Albertson et al.
patent: 3440465 (1969-04-01), Pratt et al.
Black & Decker Inc.
Budd Mark O.
Murphy Edward D.
Sherer Ronald B.
Weinstein Harold
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