Magnetic suspension assembly for a rotor

US4398773A · kind A · utility

Assignee

• Kernforschungsanlage Lulich Gesellschaft mit beschrankter Haftung · DE

Inventors

• Karl Boden
• Johan K. Fremerey · Bonn, DE

Key dates

• Filing date: May 9, 1980
• Grant date: Aug 16, 1983
• Expiry date: May 9, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C2370/00
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A magnetic suspension system, especially for a rotor, comprises a stator having two axially spaced permanent magnets which are poled the same as a pair of spaced-apart permanent magnets on the rotor so that a repulsion field suspends the rotor within the stator. A magnetic coil surrounds the rotor and is disposed between the pole pieces of the stator substantially bridging the gap between them and the permanent magnets of the stator and the rotor repel each other in the axial direction. A contactless field sensor responds to the axial position of the rotor and controls the energization of the magnetic coil to stabilize the axial position of the rotor by augmenting or decreasing the net axial forces generated by the magnetic fields in the axial direction.