[Zurück]

M. Hofer, E. Schmidt, M. Schrödl:
"Design of a Three Phase Permanent Magnet Biased Radial Active Magnetic Bearing Regarding a Position Sensorless Control";
Vortrag: Annual IEEE Applied Power Electronics Conference and Exposition, Washington, DC, USA; 15.02.2009 - 19.02.2009; in: "Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition", (2009), ISBN: 978-1-4244-2812-0; S. 1716 - 1721.

A novel design of a radial active magnetic bearing
with a permanent magnet bias flux will be presented. The
arrangement with only three stator coils allows for an utilization
of a standard three phase voltage source inverter. The control
coils themselves will be used for the detection of the rotor
position with two degrees of freedom. Hence, no external position
sensor has to be used resulting in a robust and cheap application
of the active radial magnetic bearing. Analytical calculations
using designated magnetic flux paths, 3D finite element analyses
as well as measurement results are compared regarding the
influence of the rotor position on the electromagnetic bearing
parameters. Additionally, first measurement results of the
sensorless position detection method are presented for a
verification in principle. Finally a sensorless control of the hybrid
radial magnetic bearing will be obtained.