Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-08-23
1993-02-09
Cain, David
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, 310 90, 440 6, 440 38, 440 80, 440 81, H02K 1600
Patent
active
051855453
ABSTRACT:
A high-thrust, shock-resistant submersible propulsor unit comprises of a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, and an upstream and a downstream propeller, each of which includes a separate hub rotatably mounted on the shaft assembly, first and second electric motors for independently rotating the upstream and the downstream propellers, wherein each motor includes a rotor mounted around the outer periphery of one of the propellers, and a stator mounted on the shroud around the rotor, and first and second bearing assemblies, each of which includes a thrust bearing disposed within the hubs of the upstream and downstream propellers in the shaft assembly, wherein the thrust bearings associated with the first and second bearing assemblies are located on opposite ends of the shaft assembly. Each of the bearing assemblies includes a removable cover which affords easy and separate access to the bearing contained in each. The pitch of the upstream and downstream propellers is different so that they may be counter-rotated to produce torque free thrust. In the preferred mode of operation, the propellers are rotated at different speeds such that the upstream propeller supercharges the downstream propeller.
REFERENCES:
patent: 1996195 (1933-05-01), Ferguson
patent: 3708251 (1973-01-01), Pierro
patent: 4360751 (1982-11-01), Arnold, Jr. et al.
patent: 4389197 (1983-06-01), Ballantine
patent: 4459087 (1984-01-01), Barge
patent: 4831297 (1989-05-01), Taylor et al.
patent: 4876492 (1989-10-01), Lester et al.
Brochure of Jastram-Werke GmbH KG entitled "Jastram Forschung-From the Idea to the Marketable Product" dated Aug. 1988.
Calfo Raymond M.
Drake James A.
Veronesi Luciano
Cain David
Westinghouse Electric Corp.
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