Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-12-22
1997-09-16
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 43, H02K 1300
Patent
active
056684282
ABSTRACT:
The invention is a commutator for a high speed, high power DC traction motor having a rotor with a plurality of copper commutator bars having a V-shaped groove an axial end thereof, an electrically conductive retaining ring engaging the V-shaped grooves of the commutator bar, and means for exerting an axial force between the retaining ring and commutator bars to retain the latter against radial movement during high speed rotation of the rotor. Each of the commutator bars has an axial end face with a radially inwardly extending axial depression which joins an axially extending radial depression in a radially inner axial surface thereof adjacent the retaining ring. The retaining ring has an axial end face aligned with the axial end face of the commutator bars and an outwardly radially extending axial depression which joins an axially extending radial depression in a radially outer axial surface thereof adjacent the commutator bars. An electrically insulating ring comprising a high density, calendared, polyamide paper is disposed between the retaining ring and the V-shaped groove of the commutator bar to prevent physical and electrical contact therebetween and assist the structural stability of the commutator at high speed rotation in widely varying temperatures and has an axial edge projecting into a groove formed by the axially extending radial depressions of the commutator bars and retaining ring. An arc resistant, hydrophobic, silicone polymer fills the axially extending radial depressions and radially extending axial depressions of the commutator bars and retaining ring to form an insulating band sealingly engaging the axial edge of the electrically insulating ring.
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Gawel, Jr. Edward Joseph
Stojkovich Predrag
Werner Maureen Claire
Dougherty Thomas M.
General Motors Corporation
Mullins B.
Sigler Robert M.
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