SuperseaL Solid Shaft Ferrofluid Rotary Motion Feedthrough, 389 lbs-in. Transmission Torque for CF 2.75 in. FD-CF-0500-LC

These CF 2.75 inch vacuum rotary feedthroughs, are a ferromagnetic sealed device, which uses dynamic sealing to allow wear-free and leak-free rotation of a solid shaft. These feedthroughs are not grounded or electrically isolated. These high performance vacuum rotary motion feedthroughs have the following features:

• 1/2 (0.50) inch Diameter Shaft
• Maximum No-load Rotary Speeds Up To 3900 RPM
• Maximum Bearing Static Load 344 lb
• Maximum Bearing Dynamic Load 684 lb
• Transmission Torque 389 lb-in
• Break-Away Drag Torque: 14 oz-in
• Drag Torque @ 100 RPM 8 oz-in
• Drag Torque @ 1,000 RPM 12 oz-in
• A300S Ferrofluid Base Hydrocarbon Oil
• Maximum Operating Temperature 80°C

Please see Specifications Sheet for more information

The vacuum tight dynamic seal is formed by the ferromagnetic particles suspended in the magnetic fluid (A300S) which interacts directly with the magnetic field generated by the feedthrough's internal magnets. In these rotary feedthroughs, narrow rings of fluid (shown in figure below) forms a liquid barrier filling the annular spaces (or gaps) between a rotating shaft and the tips of the stationary pole magnetic piece. Since magnetic fluids can be pushed, pulled, and shaped by magnetic fields, they remain stationary to form a vacuum tight seal. Radially, the fluid rings are bounded by the magnetic pole piece tips. Magnetic flux density at the pole tips is very large. Hence, any axial displacement of a liquid ring away from the pole tip results in a force that resists the displacement. The isolated volumes between adjacent rings are important in the functioning of the device.

Several different arrangements of housing, bearings, magnets and fluids are used for the many types of rotary vacuum feedthroughs. Many factors must be considered when selecting a rotary feedthrough for your process. The "Feedthrough Catalog" in PDF format is provided for download below that explains the technical functions and applications of magnetic fluid rotary feedthroughs, which includes: