Corona inhibition in dynamoelectric machines

Details Corona inhibition in dynamoelectric machines Corona inhibition in dynamoelectric machines

1977-10-17

1978-09-05

Hoag, Willard E.

Metal working

Method of mechanical manufacture

Electrical device making

264261, 264267, 264272, H02K 1508, H02K 1512, B29D 300

Patent

active

041109007

ABSTRACT:
According to the invention, electrically conductive paths are formed between the coil armor and the core laminations of dynamoelectric machines for inhibiting corona. This is achieved by injecting an uncured, semiconducting, elastomeric material between the coil sides and slot walls through the use of an injector tool inserted between them, and thereafter curing the material. The uncured material has a viscosity which enables it to be forced under pressure into these spaces, and when cured it has a resistance high enough not to form eddy current paths between laminations and yet low enough to conduct charge from the coil armor to the core. It is also capable of retaining its strength, elasticity, conductivity, etc., and remaining in place between the coils and core under vibrations, coolant flow, electric stresses, repeated temperature changes, etc., for the normal operating life of the machine.

REFERENCES:
patent: 3613227 (1971-10-01), Parker
patent: 3751548 (1973-08-01), Lasak

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