Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1975-05-16
1977-02-08
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310166, 310186, 310268, H02K 1514
Patent
active
040073866
ABSTRACT:
Electric induction motors are either of the cylindrical or axial air-gap types; disadvantages of the former type, which is the more common in use, are in part overcome by the latter type, but the invention provides a new concept in electric induction motors and drive assemblies of the axial air-gap type, which eliminates the need for maintenance and substantially removes the need for skilled personnel for inspection, cleaning, modification or even installation. Induction drives according to the invention have a virtually instantaneously replaceable stator core, so that a failed stator winding can be overcome by removing it and fitting a new one, so that continued use of the electric drive can be resumed after a few minutes downtime only. Various structural arrangements for achieving this are disclosed. Induction drives according to the invention also have dynamically balanced rotor structures, which operate so as to generate, in use, electrodynamic repulsive forces which oppose and at least partly nullify the normal electromagnetic attractive forces between the rotors and stators. The induction drives of the invention makes much improved use of the copper and other expensive conductive materials necessitated and include a range of other structural and operational improvements as compared with known electric motors and drives.
REFERENCES:
patent: 2469808 (1949-05-01), Aske
patent: 2635547 (1953-04-01), Cataldo
patent: 2724067 (1955-11-01), Herrick
patent: 2824275 (1958-02-01), Kober
patent: 3171356 (1965-03-01), Pensabene
patent: 3223867 (1965-12-01), Shapiro
patent: 3277323 (1966-10-01), Parker
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