Dual coaxial magnetic couplers for vacuum chamber robot assembly

Details Dual coaxial magnetic couplers for vacuum chamber robot assembly Dual coaxial magnetic couplers for vacuum chamber robot assembly

1993-01-28

1994-12-27

Picard, Leo P.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 86, 310103, 310104, 464 29, 335306, H02K 4900, F16D 2700, H02N 1300

Patent

active

053768620

ABSTRACT:
A compact assembly of two magnetic couplers for coupling two coaxial angular shaft movements through a vacuum barrier. Each coupler includes two concentric rings of radially oriented magnets, arranged to provide magnetic coupling in a radial direction between corresponding magnets in the rings. A relatively large number of magnets in each ring ensures stiff coupling between rings, but unwanted circumferential coupling between adjacent magnets in each ring is minimized by the presence of a flux ring associated with each ring of magnets. The flux rings provide a return path for radial magnetic flux lines between the rings. Cross-coupling between the couplers is minimized by the presence of a magnetic shield on each ring of magnets. The shields permit the couplers to be located in close proximity on their common axis of rotation. For corrosion resistance, each ring of magnets on the vacuum side of the barrier is housed in a stainless steel enclosure.

REFERENCES:
patent: 4163164 (1979-07-01), Pieters
patent: 4163914 (1979-08-01), Keyes
patent: 4379598 (1983-04-01), Goldowsky
patent: 4381466 (1983-04-01), Laenens
patent: 4443043 (1984-04-01), Yamaguchi
patent: 4786359 (1988-11-01), Stark et al.
patent: 4896064 (1990-01-01), Taiani
patent: 5204572 (1993-04-01), Ferreira

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