Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1975-08-06
1976-10-26
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, 310157, 310258, HO2K 524
Patent
active
039886220
ABSTRACT:
The laminated stator component of a dynamo-electric machine is prestressed in such manner as to free the laminations from temperature-induced compressive stresses that otherwise may result in displacement of the laminations. In particular, the stator lamination assembly is prestressed in tension, with respect to the cold condition, in an outward direction, by an amount corresponding at least approximately to the difference in expansion between the laminations fixed in the stator frame and those freely expanded at the same temperature. The laminations are held continuously in tension, preferably in a radially outwards direction, in the stator frame or foundation, which is thus at least partly pre-compressed inwards, in such manner that under all practicable operating temperatures of the machine, no compressive stresses can occur in the laminations.
REFERENCES:
patent: 1702448 (1929-02-01), McCarty
patent: 3237035 (1966-02-01), Hoffmann
patent: 3293464 (1966-12-01), Spirk
patent: 3387152 (1968-06-01), Mucke
patent: 3519857 (1970-07-01), Plumb
patent: 3708707 (1973-01-01), Kranz
patent: 3742271 (1973-06-01), Whitney
BBC Brown Boveri & Company Limited
Duggan Donovan F.
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