Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-04-14
1982-05-11
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310198, H02K 316
Patent
active
043296106
ABSTRACT:
An armature winding distribution for an electric motor divides each armature coil into first and second coil sub-sections inter-distributed with one another so that the first and second coil sub-sections of an armature coil undergoing commutation at one of the brushes are coupled, respectively, to the coil sub-section of an armature coil about to undergo commutation by the other brush and the coil sub-section of another armature coil having just completed commutation by the other brush. Excess energy in the armature coil undergoing commutation by the first-mentioned brush is transferred to a coil sub-section of the coil just about to undergo commutation and/or a coil sub-section of the coil having just completed commutation by the other of the brushes. The armature winding distribution improves commutation and substantially reduces brush sparking and the generation of electromagnetic interference (EMI) across a wide range of frequencies. Brush erosion is reduced to provide extended brush and commutator life and the need for EMI suppression components in motor-driven devices is greated reduced. The winding distribution is suitable for motors designed for a preferred direction of rotation as well as so-called neutral motors designed for bi-directional applications.
REFERENCES:
patent: 3733506 (1973-05-01), Jaffe et al.
Black & Decker Inc.
Duggan Donovan F.
Murphy Edward D.
Ottesen Walter
Weinstein Harold
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