Shaft mounted eddy current drive with rotary electrical connecto

Details Shaft mounted eddy current drive with rotary electrical connecto Shaft mounted eddy current drive with rotary electrical connecto

1994-10-11

1996-06-04

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310232, 310105, 310 95, H02K 1310

Patent

active

055236383

ABSTRACT:
An electric variable speed drive includes a hub member, a driven member, a magnetic coupler, and a rotary electrical connector. The hub member is mounted for rotating with the shaft of a prime mover. The driven member is rotatably supported on the hub member by bearings, and includes a mechanical output portion such as a pulley. The magnetic coupler includes an electric coil and magnetic poles which are mounted for rotating with one of the hub and the driven members. An armature is mounted to the other of the hub and driven members. An electric current is passed through the electric coil to magnetically couple the hub member to the driven member. The extent of the magnetic coupling between the hub and driven members is determined by the electric current passing through the electric coil. The rotary electrical connector includes a conductive fluid, such as liquid mercury, which extends between stationary and rotary contacts for passing the electric current from a stationary power source to the rotating electric coil. A fan and heater maintain the temperature of the rotary electrical connector between minimum and maximum operating temperature limits. Insulation prevents heat generated in operating the drive from raising the temperature of the rotary electrical connector.

REFERENCES:
patent: 3056895 (1962-10-01), Cohen et al.
patent: 3233131 (1966-02-01), Stegman
patent: 3601643 (1971-08-01), Krulls
patent: 3619681 (1971-11-01), Ginkel
patent: 3870914 (1975-03-01), Walker
patent: 4379242 (1983-04-01), MacDonald
patent: 4400638 (1983-08-01), Albrecht et al.
patent: 4410819 (1983-10-01), Kobayashi et al.
"Mercury Rotating Electrical Connectors", Mercotac Inc. 4 pages.

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