The core challenge in vacuum rotary transmission
Introducing rotational motion into a vacuum chamber is difficult. The media feed-through of a vacuum lacks the cooling effect that other media have. This normally protects sealing elements from overheating and wear. For vacuum coating equipment, this presents a particular challenge for sealing and design. According to industry analysis, this is why sealing preload and pressure ratios must be particularly easy to match in these applications.
How ferrofluid seals function
A Ferrofluid Rotary Vacuum Feedthrough uses the response of a magnetic fluid with an applied magnetic field. It transmits rotation into a high vacuum or ultra-high vacuum environment. These units are recognized as optimal solutions for introducing rotational motion into vacuum or differential pressure environments. Compared to conventional general-purpose seals such as oil seals, magnetic fluid feedthroughs offer distinct advantages in cleanliness and reliability.
Recent developments in fluid performance
Fluid improvements are a focus for manufacturers. Recent developments allow customers to benefit from reduced operating torque, reduced vapor pressure, and better thermal stability. These improvements are designed for demanding process environments common in precision coating. For instance, equipment like R2R Series vacuum coaters and metallizers in widths up to 2 meters require reliable motion introduction. The thermal management of the feedthrough becomes part of the overall system design.
Application in modern coating systems
In vacuum coating, these feedthroughs are often used to drive rotating cathodes, substrate holders, or winding systems. They are gaining attention as high-performance vacuum feedthrough technology. Their adoption stems from a need for clean, reliable shaft rotation without introducing contaminants or requiring frequent maintenance. The technology addresses various challenges faced by customers who prioritize reliability above all else in production settings.
We provide related sealing solutions for these and other demanding rotary vacuum applications.