Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1975-05-14
1977-02-08
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310162, 310181, H02K 1500
Patent
active
040073874
ABSTRACT:
An electrical synchronous machine, i.e. an alternator or synchronous motor, comprises a rotor having field coils of alternating polarities arranged on core elements of magnetic material and spaced around its axis so as to produce a magnetic field extending away from the core elements and towards a stator which has windings disposed on an annular magnetic core, the rotor and stator being arranged substantially coaxially with the rotor core elements confronting the stator core. The machine can be installed quickly in a variety of ways by unskilled personnel and the field coils and stator core can be replaced without dismantling or disturbing the machine. Permanent magnets disposed in the field coil core elements augment excitation during starting. Auxiliary windings associated with the field coil core elements regulate speed and enable the machine, when acting as a motor, to be self-starting. The latter function is assisted by connecting all of the field coils in a closed loop. By providing a large number of field coils on the rotor and arranging the machine so that both the annular areas occupied by the active face of the stator and of the field coils take the form of like, radially narrow closed strips, the machine can produce a high output at low speed when functioning as an alternator.
REFERENCES:
patent: 2635547 (1953-04-01), Cataldo
patent: 2846951 (1958-08-01), Metral et al.
patent: 3247407 (1966-04-01), Bruneel
patent: 3401287 (1968-09-01), French et al.
patent: 3428840 (1969-02-01), Kober
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