Background

• Vacuum pumps with magnetic bearings require a back up system called a “landing” or “touchdown” bearing.
• These very precision bearings instantly engage should the power fail and the rotor stop, saving the expense and system damage
• The application requires high specification quality bearings that can accept immediate acceleration to speeds of around 80’000 rpm.
• The use in the vacuum pump environment impose strict rules on the choice of materials, quality and cleanness of the bearing and components.

Innovation

• To develop these demanding applications, JESA used all their knowledge in bearing design, choice of materials and heat treatments.
• The optimization of the internal construction ensure a large number landings or system failures before needing to be replaced.

Solution

• JESA has designed hybrid bearings (steel rings and ceramic balls) with super precision accuracy, with stainless steel and quality ceramic material.
• The design uses a full complement of balls, without cage and this has provided the high load capacities needed in the application as well as the immediate acceleration from zero to maximum speed in a split second.
• Only manufacturers of super precision bearing with extremely high quality standards of production and material process are good enough for this application.

Customer benefits

• The Jesa experience and precision abilities together with a Swiss quality guarantees the customer many application “landings” with high performance.
• JESA’s research on materials, heat treatment and our high quality manufacturing processes allow JESA customers profit in the world of advanced technology products, now and in the future.
• An economical component enabling performance and quality to be increased.

Technologies