This is a presentation for the 20th Workshop on Rare Earth Permanent Magnets and Applications (REPM08) , September 8-10, 2008, Crete, Greece

1. Applications of High Performance Permanent Magnets J. F. Liu Electron Energy Corporation 924 Links Ave, Landisville, PA 17538, USA Phone: 1-717-898-2294 Fax: 1-717-898-0660

4. Why straight-line demagnetization curves? Application with load line #1: Both magnets are okay to use Application with load line #2: Only magnet #1 is suitable B d1 Normal demagnetization curve for magnet #1 load line 2 B r H c 0 Knee load line 1 B d2 H d1 H d2 B r H c Normal demagnetization curve for magnet #2

6. Vector Map Flux Density Map Halbach Dipole Structure

8. A Example of Halbach PM Quadrupole

9. Magnetic Mangles 45 o Position 90 o Position 135 o Position 0 o Position

11. Surface Coupler with 12 Alternating Poles Flux density along the center line of the air gap Flux in Tesla

12. Concentric Coupling System Applications include mixers and pumps, especially for pharmaceutical, chemical and medical applications.

13. Solid Model of the Radial Bearing Actual Radial Bearing High Temperature PM Biased Magnetic Bearings Supported by NASA Glenn Research Center, EEC/TAMU designed and built a PM-biased hybrid high temperature magnetic bearing that can operate at 1000 F Back Iron Pieces Permanent Magnets Dual Lamination Stacks Rotor Lamination Stack Small Air Gap

14. High temp magnet arc segments assembled together. Magnet arc assemblies stuck in place on outer diameter of bearing lamination stacks. Magnet Demagnetization Curves of T550 High temp magnet High Temperature PM Biased Magnetic Bearings

15. Flux Contours from EM FEA with PM bias and control flux. High Temperature PM Biased Magnetic Bearings

17. Radial Bearing Test Apparatus

21. Solid Model of High Temperature Test Rig Components We are in a process of building this test rig. It will be ready later this year.

22. Summary A new hybrid high-temp magnetic bearing was designed and built using high temperature Sm-Co magnets. It will be tested using a specially design test rig Permeance Coefficient of magnets in the electromechanical system should be carefully considered in the design and material selection stage Halbach principles can be used in many different applications