Title :
Novel high-speed, Lorentz-type, slotless self-bearing motor
Author :
Baumgartner, T.I. ; Looser, A. ; Zwyssig, C. ; Kolar, J.W.
Author_Institution :
Power Electron. Syst. Lab., ETH Zurich, Zurich, Switzerland
Abstract :
Active magnetic bearings are a preferred choice for supporting rotors spinning at high-speed due to low friction losses and no wear. However, the rotational speed in previous bearing topologies has been limited by complex rotor constructions, high rotor losses, or position control instabilities at high speed. This paper presents a novel Lorentz-type, slotless self-bearing motor concept which overcomes most limitations of previously presented high-speed AMBs. An analytical model for motor torque and bearing forces is presented and a design for 500 000 rpm is verified with FE simulations, showing exceptionally low negative stiffness cross coupling. Finally, a prototype system is described.
Keywords :
electric motors; finite element analysis; machine bearings; magnetic bearings; rotors; torque; Lorentz-type bearing motor; active magnetic bearings; analytical model; bearing forces; finite element simulations; high-speed AMB; motor torque; position control instabilities; rotors; slotless self-bearing motor; Force; Magnetic levitation; Permanent magnet motors; Reluctance motors; Rotors; Torque; Windings;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5617798
